Input needed on engine mods

moper said

My first choice would be the later 318 casting "302" heads..They are closed chamber, have much better ports, and will accept all your rocker gear.

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I had been thinking about these heads. Would there be any valve-to-block clearance issues? It's a numbers-matching 1969 block, so hydraulic lifters. I have access to an Edelbrock SP2P, in keeping with the vintage of the car- would the Performer 318 be a significant improvement?

Thanks for all the input!