They fellow who got my 54 has dropped a 250 in it. He had to drill new holes in cross member to accomidate bell housing and weld in mounts for the front mounts. also moved radiator forward to clear water pump. the 54 transmission bolted right up to mid seventys bell housing. He decided to eliminate the hydrovac and installed a ford firewall mounted dual resivoir master cylinder and pedals cable pull throttle from unknown year chevy.