Buster411

I am looking for recommendations for a new harmonic balancer and flexplate. I have seen internal and external offered. I am not real familiar with the Olds 455. I am building the short block and using stock rods and crank and I am having it balanced. I would like to go to a serpentine belt system, if there is one that is not too expensive. I also plan to put a 700R4/4L60 behind it with an adapter. Has anyone had any experience doing that? Thanks, Royce