Yes- a modified and warmed over 6 is does get attention but that attention comes at a price. Expect to pay a lot for a little gain. Two relatively cheap mods (depending on your level of mechanical ability) is swapping in a Duraspark and mounting a two barrel carb. You can use an adapter and run Weber but that can cause hood clearance issues and you still have all that flow going through a small hole in the intake. A different route is to get a later, large log head and have it milled flat and enlarge the carb opening and drill and tap an autolite 2 barrel carb spacer (the spacer I used had the voids filled with JB weld). The carb bolts directly to the adaptor. The Autolite 2 barrel is simple, reliable and common and the one barrel cabs can be finnicky. Going beyond this, additional mods ( cam, aluminum heads, roller top end, etc) and you start getting in some big money. Check out my profile- I could have build a supercharged V-8 easily for what I have spent on my six. I do enjoy the uniqueness of my car but if I had to do it all over again, the smart money would have been on the V-8. PS-ignore the advise about putting the exhaust spacer in the center ports- it is a PITA for no gain.