I did check it. The info I've got doesn't mention the use of the Chevy 6 in the GMCs in those years, other than the forward control and Handy-Van. However, it seems that perhaps the info I have is wrong, or it was just not a common option chosen. I will admit, most of the info I have on the GMCs from that era is for the 4x4 models, and the V6 is the only engine listed. I've also never seen a GMC from that era with anything but the V6. I will say that I have seen a few Chevies with the V6, but only in heavier trucks, never anything lighter than a 1 ton.
