Do yourself a favour and when it comes time to bore it, use std 400 pistons. Then you can use std 400 chev rings and file fit them, for a fraction of the price. It'll work out to be about 0.060 over. You can get cast pistons with both valve reliefs or use forgies with the later valve reliefs which will allow you to use later heads when you get sick of the ever always pinging early closed chamber jobs.
My 0.02c
Kris
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