Just mock it up, and check!
Either use light "checking" springs on the valves, or a solid lifter. I put a light dab of primer on the valve head, installed the rocker arm, rotated the motor a few times, and looked at where the primer was removed. With an adjustable pushrod, just adjust it and repeat the process until the pattern is centered (or wherever you want it), remove the rocker and measure the pushrod to find out what length you need.
Remember to clean off the remaining primer!
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'73 T/A (sold). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 317rwhp/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
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