360 vibration ....help

Thanks for the input. Yes the weight is on balancer.

When I took the cast crank to a local machine shop the guy told me I was crazy for wanting to balance that crank and it wasn't worth it.

I assumed (I shouldn't have) the pistons and Rods would be closer than than stock and wouldn't have to be balanced. Maybe I'll try a converter, if that doesn't work should I tear down the engine , maybe look for steel crank ?