[d_ford]

I have a Dove aluminum 427 tunnel port that was stroked with a 428 crank and rods. It has an aluminum flywheel that I want to replace with a light weight steel unit since I'm putting it in a heavier car (mustang). My question has to do with the balance. Can I reasonably assume that it was internally balanced and therefore would use a zero balance flywheel? I didn't build the engine initially and I know there are balance differences between the 427 and 428CJ engines. The aluminum flywheel that came on the engine doesn't have counterweights cast into it but it has been drilled a number of times. (probably for different balance engines?) I don't want to have to take this thing to a shop just to find out how it's balanced just so I can buy a new flywheel for it. As far as i can determine, it was originally built by a shop called S&S engines possibly in Iowa. Any input greatly appreciated.