1.never heard of push rods rubbing before the hardened push rods are the same dimensions
2. original push rods are fine no need for different length rods
3. you don't need hardened but it wouldn't hurt
4.valve springs choice comes down to what mods you have /or have planed
if it is a stock cammed car go for some pac 918's
you dont need retainers but again they are better


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