I need to post a correction here because when the machinist cleaned absolutely all the crud off the old piston and checked both with a height guage on a flat surface the V8 pistons turned out to be SHORTER!!!! Moreover, he called GM and the tech said do not drill for the oiling journals because there isn't enough material to remain structurally sound. This partcular tech had never heard of putting 307 pistons in a 250, so I don't now how much he can be trusted, but comparing the pistons the originals are a lot beefier.

Boo

Paint it black with a rattle can, and drive it like ya stole it!