A bone stock Olds 455 will twist your frame so much you will be able to see the bed move up in the rear view mirror when you stomp the go pedal.
I would put it in the truck and drive it before I did any changes.
Carl

Last edited by 52Carl; 01/15/2019 2:20 AM.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission