OK I have cruised all the old post and discussed it with my buddies but still don't have a definitive answer! What are my options for a trans for my Nailhead I have two a 1957 364 and a 1965 401? I was originally thinking about updating to the 700R4 but the adapter kit prices are $$$. My buddies think the BOP trans should fit but everything I find here indicates otherwise. Then there is the Turbo 400 but what years and models fit what? I had finally decided to go with my first thoughts and use a rock crusher but the bell housing and clutch kits are again high $$$ and tough to find that will fit an overdrive tranny. Hey I am not trying to be cheap here but I do have a budget on this 32. What are the facts and some opinions please.