318 with a new 4” crankshaft.

hwy2 said

I was going to use same stamped rockers that it came with.

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They’re likely to flex with the added spring load and acceleration from the roller. Also, the ratios won’t get the listed lift figures from the cam. You’ll have to measure for push rods once together. And, you’re really going to want adjustable to get the preload right.

Not trying to discourage, just want you to get as much out of it so you’re not too disappointed with your build. Three people in a row are recommending against the stock rockers…