Assuming 1.5 rockers, I’d shoot for 145-160 on the seat, 375-400 open...... for operation up to around 7200rpm.

For 1.6 rockers and/or more rpm, I’d be more like 400-425 open.

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68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads