? for Machinist, stroking a used 360..

Low 11’s seems like a tall order for that overall combo.

Carefully inspect the tops of the bores for any ridge.
It’s almost certain the new forged pistons would have the top ring traveling higher in the bore(riding over any ridge that’s there now).

Assuming a race weight in the 3400lb area, the one second improvement you’re proposing will need about 110hp more to get you there.