Alright I'm finishing up my new (on shelf spare ) for my 79 malibu it's a 383 all forged balanced eagle rotating assm including pistons installed in a 92 4 bolt 350 block my cam is a hyd roller 565/580 lift 243/253 300/306 duration I've got 2 sets of heads setting here first a set of edelbrock aluminum rpm heads which are 185cc intake 64cc chambers 2.02/1.6 valves the other set is dart platinum iron eagles steel heads 200cc intake 64cc chambers 2.08/1.6 valves both are set up for my cam motor will be 11.2.1 compression with either the car the engine is for sees more track time than anything 3200lbs with me in it 4.56 gear running through a powerglide Trans and a 10 inch tire I've come up with different ideas why one might be better than the other the biggest appealing thing about the edelbrock heads are weight gonna be 50lbs lighter than the eagles but most builders are saying the performance of the eagles will overcome the weight gain give me you thoughts can make a decision on what to do gonna let you make the decision for me