$800 sounds like a custom piston. You'll end up an expensive piston on top of fairly short stock rods, a cast iron crank and a possibly thin wall block and 40_ cubes... not the optimal setup.

If you want to keep cost really low you could use a cast replacement piston and limit boost to 5-7 lbs. Then once you get the setup dialed in build a bigger/stronger lowdeck.

Or get a 451 stroker kit with a shelf forged piston from 440 source or another vendor. You would have a stonger crank and rods plus more cubes without a lot more money.

Whatever direction you take, at 60 over with boost I'd get the block sonic checked and don't be surprised if it needs a sleeve or two due to thin cylinder walls.