I am building a 1970 LS6 454 which is a brand new short block (purchased 30 years ago & never used). I had the BBC originally professionally built but never fired the motor nor put it in anything. My problem is I DO NOT KNOW what heads were installed, but they are supposedly open chambered, street ported, with 1.7 Crane gold rollers & a Jomar stud girdle. My question is what heads would be BEST to run with the 11 1/2 to 1 forged pistons in the LS6? I would like to run 10 to 1 compression or as high as possible mixing premium with octane booster. Would you suggest aluminum heads or iron heads? I've seen many on ebay, but don't have a clue as to what I should be seeking. My engine is being professionally torn down now so in a week or so I will know for sure what heads I currently have. If they are not the RIGHT ONES, I want to make sure I purchase what will work best. Weight is not an issue because the BBC is going in a 30 A-bone roadster. Thanks for your input!