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I don't recommend cutting into the head. Use dished retainers.

use +.050 retainers and +.050 keepers



and then make sure you don't have interference between the rocker and the retainer. also pray that the 40 year old heads haven't had the valves tipped so much that the +.050 locks and retainers aren't going to sit above the stem.



And that the lash caps (might need them to get that rocker-retainer clearance) don't bottom out on the locks.