Changing engine bearings?

hello, i had a oil leak in my car witch ended up in a seized engine, i have taken the sump off and taken off the bolts of the conrods and the shells are very damaged, it seems i can now turn over the engine when the conrod bearings are removed, if the conrod bearings are damaged does this meen that the shells on the main crank bearings will be damaged aswell? would it be possible to replace these bearings without removing the crankshaft, also one of the conrod bolts is a little bit rounded off , how would i take this of and could i buy new bolts ? thanksChanging engine bearings?
No shortcuts here. The crankshaft needs to be turned to accept new oversize bearings (if it's bad enough you may need a new or used ';turnable crank) and the con rods should be reconditioned. Basically a whole bottom end rebuild but it would be a mistake to not rebuild the head(s) at the same time.Changing engine bearings?
INVEST IN A REPAIR MANUAL..CHILTON OR HAYNES BRAND FOUND AT LOCAL AUTO PARTS STORE

IT'LL GIVE STEP BY STEP PROCEDURES TO R %26amp; R PARTS
Sounds like this engine is finished. Dont waste any more of your time on it, find a used engine and just replace the one in the car with the used one......
If you have the time you could get a manual with step by step instructions and the dimensions needed to rebuild it which it needs(time consuming the motor needs to be removed) or you could get a rebuilt which is the better way to go.