My first question would be, Why do you want a 270 GMC?
If you are thinking about repowering an older unit, repower it with a more modern engine. A '65 or later 292 would be a much better choice. With a little work on the head, a Clifford cam, HEI ignition and improved carburation the 292 will but out 300 HP.
The 270 is two inches longer than a Chevy 6 and it is antiquated technology. Wm.
