Didn’t know if this would be better for drivetrain section or engine. Recently did a 347 build. Had it running in car with the M5r2 trans. Used a stock 95 f150 flywheel that the engine builder SAID he rebalanced it to 28oz to match the stroker kit. I see where he did drill holes in certain areas of the flywheel but some suggest to just buy one that is already 28oz balanced. The motor did have a vibrating shake to it. Anyone know the best place to get one or have a part number for it?? Thanks guys!