Re: 350 CHANGE OUT FROM 305
check the bolt patern for the flywheel, all small blocks( except the 400) use internally balanced cranks, all the flywheels should inter change as long as it has the correct bolt pattern, they changed the bolt patern when they went from two piece rear main seal to to one piece(85?). There may have been some total weight changes for the flywheel , but they should all( ex. 400) interchange as far as balance, just make sure you use the right starter with the corrisponding flywheel.
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