LOOKING TO SWAP ENGINES REPLACE THE TIRED 390 WITH THE FT ENGINE, I NEED TO KNOW IF THE ROTATING ASSYMBLY MUST BE REBALANCED TO USE ANOTHER FLYWHEEL EVEN IF IT IS EXTERNALLY BALANCED. THE FT CRANK'S FLYWHEEL WON'T FIT IN MY BELLHOUSING.
THANKS FOR ANY MORE HELP WILL POST CRANK AND ROD #S AFTER ENGINE IS REMOVED FROM PICKUP.