need help with big block motor swap

[stireson87]

hey guys i have a 72 long bed, it had a small block 350 in it. I got a great deal on a big block. My few questions i have is. Will i have any clearance issues where the current small block set compared to the big block. Also will the stock small block frame mounts work? it looks like they will but i am not sure. I am running headers so there shouldn't be any frame issues i would guess. My other question is will i have to move the motor back possible to have room up front since the motor has a long water pump, my small block had a long water pump and i have just enough room for ele. fan to water pump pulley. Any help would be awesome as i have tried looking and have no got to much help or answers to my questions.