If you have a engine tilt there is no need to take the front end off just the hood. There are Caddy performance places like Maxium Torque that has special motor mounts to install motors easier. Good info you provided, I just wanted to point out that anyone that puts a Caddy motor in a truck should check main berring clearance. The center thrust in Caddy has a closer tolerance than Chevy and tend to wear out sooner. I made this error once and had to pull out after one week because of a main berring. I found that the 71 -76 500 ci runs well on pump reg. gas. The earlier 472 with higher compression 10.25-1 needs high grade fuel to run proper timing with out spark knocking. After 70 the 472's also run great with more torque than you ever felt with any unmodified Chevy engine. I am not knocking Chevy just sharing info I have learned. Keep on trucking!