My restoration project is a 1973 GMC Motorhome, which has an Olds Toronado drivetrain. Also a 455, but an Olds engine, not the big-block Pontiac. Very strong motors--high-nickel blocks, forged or nodular iron cranks, etc. Turbohypertraumatic (spelling?) 425 transmission with a chain drive to turn the drive around for front wheel drive--basically a backwards running Turbo 400 with a chain drive between the bell housing and the input shaft, so that the transmission case runs alongside the driver side of the motor. The final drive is a 3.21 from a Cadillac Eldorado with robust planetary gears, about even with the front of the engine. Wonderful engineering on those things, especially for a motorhome, but the paint now resembles school chalk. Painting a 23' motorhome is a little beyond Earl Scheib.