As you may already know, both of these are from the 69-71 Trans AM Boss 302 setups. Some trick sheetmetal work was done on these to lower the front nose of the fenders and radiator core support. I'm running the same setup as in the second picture (B/M miniplenum) and it's tight without the modifications. The first picture may be the I/R dual dominator setup from the 69 season.
All of these setups required custom airbox intakes.
If you're running a track car with a standard carb setup, you can get some lowered air cleaner housings, also called a drop base from Summit or Jegs. That way you can run a large air filter still. Just make sure you don't choke the air flow going into the horn of the carb by dropping it too much and running a short air filter. You'd also be well off to go with a carb that has the choke housing milled off.

 

I've seen them called as carb hats. You could get one such as this and modify it for your application. (Not as sophisticated as the ones you posted).

Spectre 98999 Carb Hat Air Bonnet Plenum, Holley Dominator, Dual

The Spectre air intake plenum is designed to fit Holley Dominator carburetors with a 7-1/4 inch neck. This plenum is fabricated from high quality cast aluminum to withstand the pressures of boosted applications and has a polished finish for a show car look. The plenum is low-profile and measures...

www.speedwaymotors.com

Sent from my SM-G975U using Tapatalk

 

This is just an old version of a cold air intake. You would gain as much just by using a cowl induction hood(or a shaker hood in the case of a Mach1). In the end, its simply not worth the effort unless you are trying to squeeze every last HP out of your car. It would make the most difference if you are running headers that aren't wrapped and heat up the engine bay a lot.

 

Sebastien, what kind of track use do you have in mind ? dragstrip or roadrace ? LSG

 

It would be interesting to see how much power those boxes kill lol. Forcing air to make sharp turns through a thin air box certainly is not helping. The only benefit i can see from those setups is that they draw cool air from outside the engine bay. In road racing that is important as engine gets really hot. So that airbox is kind of a catch 22 one big plus and a big negative. I second LSG post, are you going to be drag racing or roadrace ?

 

I doubt they affect power at all as long as the snorkel(or snorkels) diameter is sufficient to supply the engine with enough air and both those pictures seem to have sufficiently sized snorkels. I did the math on this when building the lower air box for my engine and determined that a single 3" snorkel is sufficient for around 400HP. Carbs in general have really poor airflow dynamics...or rather the path the air takes is just plain bad...it goes through the filter horizontally and then needs to make a 90 degree turn vertically into the carb without the assistance of a bellmouth. Thats why if you are going for a cold air intake on an engine with a vertical carb sitting on top, your best bet is to go with cowl induction or some type of scoop with an "air cleaner" that has a filter type top...and if you have enough room to run some type of velocity stack(even a short one of around 2-3 inches high) leading into the carb.

Honestly speaking...classic v8s with a vertical carb give zero though to airflow: Just take a look at Weber carbs(either sidedrafts or topdrafts):



Not all Webers have velocity stacks of course...but all performance oriented Webers do. You see the same thing on motorcycle carbs...and those guys fight for every last HP. Hood clearance of course is an issue..but this is why back in the day you had all those IDA manifolds:

I have seen several like this featured in old 60s hot rod magazines.(would be fun to build a SBF using one of these Weber IDA manifolds, its still available at Summit)