MR454SS has a good point, the pump will bolt on whether or not the pushrod is up against the actuator arm of the pump. You can use a little dab of grease on the pushrod to hold it in place while you put the pump on. I do believe the pushrods are different from a small block to a big block.
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Steve
72 Chevelle SS402/4sp
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Steve
72 Chevelle SS402/4sp
