i was thinking if i turbo this engine what would be the hp limit before the stock rods break and the block cracks and wut about the crank if i was going to do this work i would do a rebuild with Arp bolts and copper head gaskets
Assuming a good rebuild with quality parts including forged pistons and a reasonable boost pressure you should be able to easily run up to 500 HP as long as you put some sort of rev limiter in it to keep under 6000 RPM. I would definitely make sure to keep the static C.R. around 7.5:1 to avoid detonation issues. 351M/400 heads aren't known for their great resistance to pinging/detonation.
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