[Shyguy]

When we put a '73 454 out of a C-20 in my '71 lwb stepper we used the motor mounts from the '73. The stock exhaust manifolds would not clear the clutch linkage so we went with headers.

When we mated the engine to the old 4 speed transmission we let the engine settle and drilled new holes for the motor mounts. The firewall clearance was good and so was the fan clutch to radiator.

We used the complete 454 including the water pump, power steering pump and clutch fan. My '71 already had a 3 core radiator and the engine runs real cool. We used the temperature sending unit from the 350 that was in my truck.

We also used the fan shroud from the '73 but had to notch it for crank pulley, power steering pulley and alternator pulley.

Good luck.