340 stroker build questions

With a target of only 425 HP, which is just over one HP per cube; your crank, rods, and pistons should give you a durability level almost half again of that number. As a suggestion of what more to do to the block, have the lifter bores trued and sleeved, main studs.

No reason to have the lifter bores trued and sleeved for a 425 HP 4" stroker motor:
Main studs if you wish or new cap bolts.
A cast Scat crank would be perfectly fine for this too.

But a turbo down the road would need a forged crank, studs, and more. But you are going to need pistons or heads changed for that to lower compression. So you are not going to just bolt on a turbo and go (like that would happen anyways)

What's the reality of parts that cant' be used on 425 HP stroker motor parts with a stroker turbo motor?