Set one intake and one exhaust up with two of the pushrods you currently have and your checker lifter set at zero lash. Put a dial indicator on the retainer and see what your max lift is while you rotate the engine over. A longer pushrod will get you more lift at the retainer. Most people will tell you to pay attention to the contact patch from the tip of the rocker to the stem of the valve. I have never really payed attention to that and have never had any problems.
Andy
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88 coupe
91 LX NMRA Pure Street 5120
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