Just Purchased Virgin 340 Short - What to do with Pistons

crackedback said
71 casting date could easily be model year 72 with the lower compression in the hole pistons. Never seen a 68-71 340 with factory pistons not at least at deck height or above.

Factory ever use a piston with 4 valve clearence 'eyebrows'?

That's strictly aftermarket, isn't it?