I bet if you ask around at your local salvage yards they have some. 302's can be proned to cracks between the valve seats. Get them checked out soon after you buy them.
I have a pair tanked, magnefluxed, and milled .020 and .019 on the intake side. One is perfect the other has rust pitting, but would clean up nice with 360 valves that I can give you for what I have in them.