Guy has a rebuilt 1991 Gen V 454 w/accessories and a TH400 for sale in my area. I have/had a 355 with 3spd manual. What pitfalls am i looking at with this swap? I have the Double Hump crossmember for the 3spd so i assume i will need a different one for the TH400? I know headers will have to be addressed. What about motor mounts? I cant recall if the BBC will use the same mounts on the frame or if they will need to be moved? Any insight any one can add is greatly appreciated.