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Originally Posted by Rev
The best bet is to get an adjustable length push rod, use a solid lifter, and find the length that keeps the roller tip right in the middle of the valve stem face when the engine is cranked over. That gives you ideal valve train geometry and best performance and least valve guide wear. You would have to order the correct length push rods after that ideal length was determined.
Rev
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Yeppers! I have a set of Canfields on a "302". I'm running 6.905" pushrods. No two engines are the same, so do like Rev said. Measure for yourself. Ya want the rocker tip to be a bit towards the intake when the cam is on the base circle. Right in the middle at mid lift, and a bit towards the exhaust at max lift.
On this one, it's best just to measure for yourself. Valvetrain geometry is THAT important. Get an adjustable pushrod (I'm guessing you'll need Comp Cams part #7702) and go from there.
Valvetrain geometry really is THAT improtant. Improper geometry will cause all kinds of problems, and have you chasing your tail around in circles.