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I have a '65 el camino with a 283(casting number 3849852). It has power-pack heads from 1966-1967, 1.72/1.50 int/exh valves, 60.530cc combustion chanbers (casting number 3884520) rated at 195-220hp. The intake manifold is casting number 3844457 from 1964 rated at 220hp for the 283. I have a 600cfm edelbrock carb, flowtech long tube headers, msd hei distributor/wires, dual 2.25 exhaust with flowmaster super 44's, all already installed and running. It runs great, but i want more. i already have an edelbrock performer eps 2701 manifold waiting in my garage to put on. MY QUESTION IS THIS: Will edelbrock aluminum heads benefit my motor? I want the E-street #5089 with 64cc chambers, 185/60cc int/exh port volume, 2.02/1.60" int/exh valves. Will these heads work for my motor? Are the valves too big to clear the cylinder walls? And will the increased combustion chamber size (64cc,edelbrock vs. 60.5cc,stock) decrease my compresstion ratio and cause a loss of horsepower? The edelbrock heads are only $910 assembled for a pair, so they are relatively affordable. Any advice anyone has would be greatly appreciated. I really like this little 283, and just want to make it as hot as i can and still be reliable. Anyone knowledgeable in 283's? [email protected] if you want to E-mentor me. Thank you