Bill, you have a similar set up to what im looking for. Except mine will have forged internals, and 29 more cubic inches..... how much horsepower do you estimate your car to have? How is it off the line?
Maybe it is just me but I've run two 5.0 aluminum head engines on the street and both ran a little hotter than the iron head equivalent. I think aluminum transfers more combustion heat into the coolant quicker than iron, which means that the cooling system has to take up the slack. It's not a problem, just something to be aware of simply because you would not want an inadaquate cooling system jepordize those beautiful new heads...
Aluminum does transfer more heat to the coolant, thats good or bad depending on how you look at it. Bad, it raises your coolant temp and in extreme cases may require a better radiator. Good, because it transfers more heat theres less heat in the combustion chamber, less likelyhood of detonation occuring and it gives the ability to run a bit more compression than you would with an iron head as a result of these properties. Dont forget the weight loss over your front wheels too. Oh and they look trick!!!!!
Checked out your page. Question, why the V-8 in the SVO? My '86 screams(13.90's in the 1/4) & gets well over 25 MPG. Is this something that's getting popular in the '84/86 SVO"s? BTW I think you're correct on the heads, my Blue Thunders are a little hotter but I just figured it was better dissapation as well.