Just Purchased Virgin 340 Short - What to do with Pistons

The factory pistons are probably the lightest ones you’ll find. If you can check the deck height, most of stock motors are way under. THe piston should be .040- .045 out of the block. Like ir3333 said the head cc is most likely 70-74 cc stock. This knocks the compression down quite a bit. I had a ‘71 dart with ‘69 340 all stock, pistons, heads cast iron intake and a .480 lift cam. With 4.10, headers, car ran mid to low 13’s. Raced it for years.