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Majority of the small block chevy`s I`ve seen use the same push rod. You`ll need a aftermarket pushrod that`s heat treated. The comp magnum push rods should serve you fine. If you`re referring to lenth, that`s a different story, the lenth is different between the gen. 1 flat tappet blocks and the Gen. 1 roller cam blocks. The only reason you should need a different lenth pushrod is if the block or heads have been milled, and then it depends on how much was milled. There is a pushrod lenth checker that many of the cam companys sell, you`ll find them in Summit or Jegs.
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