The way I remember is the 410 had it's own specific piston. That said they were also used in all the low compression 360/390 truck engines. Thr 410 slugs lowered the truck 360/390 compression enough at the time. So you need to decide how much you want to spend. Is this a performance build or a stock type rebuild? I'm pretty sure Slivolite and Federal Mogul sell them in cast. And I know Ross or Diamond can make them forged but $$$$. I'm not sure if they are available in KB hyper applications. Let me poke around a bit and see what else is out there. BRB....G.