Cast or aluminum intake?

As far as low compression, I wanted a car that was street able and run off pump gas instead of airplane fuel. Letting my machine shop guy know this he advise be not to go over 10 compression. With my build I could of got heads with 10.3 compression. I will definitely run a eddy air gap knowing the Horsepower difference and of course weight. I may have to look more into this compression issue. Unfortunately heads have been ordered and received.