I don't think its reasonable to expect a stock 235 with original running gear to compare to what can be done with EFI and an OD tranny. Better than 10 yes, 20? That's a little optimistic.
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...
