392 was the bigger dump truck motor I believe so it's possible although I think the 345 was the most common. I think it's another of those where it was the same block kind of deals. My buddy really beats himself up for getting rid of his scout 2. I towed a early 70s travel all he bought for parts from Chattanooga to Nashville with my half ton GMC, on a uhaul trailer. The look on the guy's face at the scout place was priceless when I pulled in the yard with that rig. I'd still have that truck if it hadn't got wrecked and started eating tcases. I was impressed coming up mount eagle at 60 with that. But I digress.