what am i missing

[Mr Chevorlet]

Well let me just say thanks for the help on the cab mounts. i got the cab setting on the frame but the hump of the cab is hitting the top of the transmission, When i picked up this frame it had a big block in it and it was not origanal i dont think. but is my problem with the motor mount perches, i have a 350 with a 350 turbo in it now. What would be the difference with big block and small block mounting. Or am i missing something else. I am working with a 4x4 72 truck frame with a 67 cab which i dont think that is my problem. Please help