I have decided to proceed with my 6bt swap into the 48 B1F. I knew at the onset the firewall would need to be doghoused and im fine with that. I will rubber mount the engine and trans and it will be 2wd still so no twisting and bouncing on the frame. Ive discussed the swap with a few and all seem to agree it will be fine in this application. I cant wait to get actually working on it. Thanks for the follow up, its nice to hear peoples input.