Okay, you are going to need to use the unbalanced flywheel, or the equivalent. From John's drawing the unbalance is 6.5 inch/ounces or one ounce 6 1/2 inches from the center of the crank. The factory got the unbalance by drilling in the specified locations. What I would do if I were you is to take a neutral balanced flywheel and ADD weight 180 degrees from the drilled location at the pressure plate bolts. Yes, it would take some math to do the splitting as the pressure plate bolting is not directly in line but it is not advanced calculus. This way you can get the engine run in AND not modify a neutral balanced flywheel.
Good thinking. For just starting and run checks below 2500 rpm, you can get it close enough. The better the math (and scale), the better the results.
