Hi Guys, I'm new here. I just had a 1977 F150 4WD given to me. It's got a 351M/400 engine, 3 spd stick. Been sitting for about 10 years but "it was running when I parked it" kind of thing. Engine seems to be locked down and the guy told me the front lock outs were shot and it wouldn't lock into 4WD. Here's my question...I'll probably swap out the engine for a big block but want to keep the tranny, etc. Just swap the engine. Don't know what tranny's in it or what it'll bolt up too. Just reading other sites, I'm thinking the bellhousing will bolt up to any big block 400/429, etc. Anybody out there swap out something similar? Thanks and the site rocks!