That 60 degree V6 is not a chevy engine it is a GMC design, chevy never used it in their trucks. Since a Pontiac was available as an option in 55-57 GMCs there should be plenty of room for the swap and possibly I have a feeling that if you could find GMC/Pontiac mounts you might have a starting point to work from. These early trucks(55-57) used one central mount under the cast iron timing cover and I believe 2 side mounts on the bellhousing area.
If not you would have to fab later style motor mounts (2 side mounts and a single central transmission mount) and which should not be too difficult if you have decent fabrication skills. I've never done this particular swap but it can't be any harder than putting a Pontiac Stratostreak V8 in a 4X4 Jeep Wagoneer or a Jeep pickup truck which I have done.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
Last edited by Sirrotica; 07-11-2011 at 07:38 PM.
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