Are you looking to totally rebuild the engine, or just bolt on some different heads? As stated above ^ you'd need dished pistons to use the 13 or 62 heads and run pump gas.
How much power are you wanting?
I have a 455 with 114cc heads, pistons over 0.020" in the hole and 0.030" over CHEAP pistons (built by previous owner) with the beveled outer edge - so I'm under 8.0:1 cr. But with a cam I designed and a set of Tri-Y headers, it runs surprisingly well. With a stock torque converter and 3.08 gears, it will smoke the tires from idle (no powerbrakeing needed). And it runs on 87 octane with no problem at all.
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'73 T/A (clone). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 315rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'.
'67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust
My webpage http://lnlpd.com/home
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