I've driven my GMC 270 powered Suburban up and down I-5 in Washington at 70+. The only meaningful mods are a 3.08 geared rear, disk brakes in front and Cragar mags with modern radials. And better seats.
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more... It's true. I really don't do anything but browse the Internet looking for trouble...