I respectfully disagree with just about everything in the last post except for the part about the kind of damage a blown head gasket will do. No disrespect, Randy, but I've used aluminum heads extensively.

Edelbrock' performer heads are terrific parts. They have taken the time to match all of their components for maximum performance, and matching parts is what engine building is all about.

First, aluminum heads seal perfectly fine if you use the right gaskets. If you buy Edelbrock's heads, ask them what gaskets to use. If you follow their specs and torque them properly, you won't have any problems. After all, the auto manufacturers have been using aluminum heads on iron blocks for years now.

Second, the aluminum heads let you run a higher compression ratio without detonation.

Third, modern antifrezes are formulated for aluminum heads and engines. Double check the label and make sure it meets the GM1825M specs (like Texaco Dex-Cool). I've got 120k miles on my aluminum head LT-1 Vette. No problems. Do NOT run 100% antifreze.

Assuming I had to buy heads, I'm not sure I'd ever run another set of iron heads on a performance engine.

Something else to think about. You stated that your engine was mostly for street use, with an occasional trip down the quarter mile. Depending on the cam, carb and intake you use, these heads may come in at a higher RPM than you would like on the street - especially with a 3.37 gear.

In your shoes, I'd check with Edelbrock's tech department in addition to what you might discover here.