I have a 1980 302 and I am putting a new t-5 into it. I have all the parts now, but I believe I have another problem. I have a good used 50oz flywheel for the tranny and the engine has a 28oz harmonic ballancer on it. Can I change out the ballancer to a 50oz or do I have to get a 28oz flywheel. The harmonic ballancer is cheaper to get.

 

I think ya have to stay with the 28oz unless you have the crank rebalanced as well.