318 with pop up pistons and 302 heads?

That shape that surrounds the company's name should be your first clue. How much of the piston is out of the cylinder? Just a dome, or the whole"flat top"? That has more bearing on compression than anything. If they're only 15 out of the hole, after you put a thick blue gasket on it, you'll have approx. 40 plus clearance. More than enough.