IRC, from one of the other threads the OP lost a previous engine because the head of a Ferrea 5000 intake valve broke off. Sounded like maybe the bronze guides where loose, I suppose that may have contributed to the failure, but it shouldn’t have happened, I don’t know what else could cause a failure on a Ferrea in a mild street engine other than just some really bad luck or something hitting the valve.
If the plan is to not put a ton of miles on the car with this reringed 455, 041 cam and the knurled guides are tight yet, I would run the guides as is. FWIW, switching to dished pistons on rering bores make sure the ring packs on the new pistons don’t go above the old ring wear pattern, and make sure the skirt clearances are ok.
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