Though I have no experience with this particular subject, my only comment is if you are a GMC purest and have problems sleeping because of what you are doing to the rig, then stay with a GMC motor.
But if you like modifying your truck and plan to be buried with it, then do what you want. If a Chevy motor is infact a lighter motor and will make your rig shoot down the road with less effort, then that is something to consider.
Thank goodness I don't need worry about this type of decision.
Craig
My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear
My truck ....... Respect The Rust
If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.
