Rough & Not Quite Ready Yet

[original condor]

Howdy folks, I'm slowly smoothing out my 70 K10 longbed. I bought it with 350 with 12,000 mi, 650cfm Edelbrock carb, & Performer intake, headers, granny 4 spd, 4" blocks in back on a truck 12", & 44 in front, fairly straight body with rusted out rockers & some floor boards, but zero rust at driprail/gutter or lower back corners. Has bad paint, mediocre interior, but runs like a bat out of hell due to a big lumpy cam, way too much for the comp. ratio you can get fuel to run. I would have never used this cam but that's how it came. I'll put an RV cam in it when I pull the engine. Paid $2500 so I'm happy so far!
I'm concentrating on finding, exposing, phosphotising, then priming with rust reformer, then recoating all with paint, or rubberized, paintable under coating. Also scraping grease, & other stuff that requires very little money, just lots of time & elbowgrease.
Today I discovered marks on my rear diff that showed the housing had rotated slightly from the wrap up under acceleration, so I broke out the breaker bar and 7/8 deep socket, & proceeded to bear down on the u-bolts
but before I took them to the max I can do with my feet against the tire, pulling with both hands, my back & my legs, I figgered I'd better ask whether
it's possible to overtighten those u-bolts? Any advise would be appreciated