I am still building up my 292 y block. Found out the stock 1956 bolts that I used are grade 5-6, and tend to stretch. I want to change out to grade 8 bolts. They are new gaskets, motor has never been fired. The are Best Gasket brand head gaskets, some kind of graphite composite material. If I change out the bolts one at a time will the gaskets still be OK?
Paul