Offset piston in a 59 AB

[Step-down]

So a 59AB I’ve been messing with has offset piston ,( all new) The crank has floaty rod bearings. Don’t know the history other then it was just rebuilt by unknown
Motor was overheating . I’ve pulled rust and clay out of the block, enough to fill
A peanut butter jar.
EveryThing been decked and harden valve seat .
Balance crank /Max 1 .Odd the block was cleaned

My question has anyone seen offset pistons in a 59AB
Advantage or dilemma