Bowl blend the 452’s, mill .030, correct intake side, use steel shim gaskets.
While they’re off, have them set up for posi valve seals and increase retainer to seal clearance....... upgrade springs.
However, if after pulling them apart, don’t be surprised if you see ex seat recession.

If your headers are angle plug friendly, and it’s in the budget..... the 75cc E Streets make a lot of sense.

Crower 271HDP cam

11” converter