exhaust valve size increase on J head

Bodyperson said
Yes.. at high RPM, but the port velocity needs to be there.

At any RPM. And engine is an air pump no matter what RPM it's at. 100-10,000 It's all about flow.

But run whatever valves you want. 1.88 intake and whatever exhaust. With stock manifold. On your stroker. Let us know what happens.

Power to yah.