A guy I know has a '77 Suburban with a SB400 in it. It currently has about 700-900 miles since it was last rebuilt. It's .040 over, has flat tops, and a decent cam. It has an Edelbrock intake and all the chrome accessories; oil pan, timing cover, valve covers, bracketry, etc. He has always wanted a big block though. I have a 454 in a '75 Suburban that is completely stock. I dont know the mileage on it, but it has always run good and had decent power. Externally it is filthy looking. It uses some oil, but not a whole lot. For the application he uses (mud racing) it would need to be gone through. I thought about offering a trade straight across. But would I be ripping him off; or would I be fair in offering a trade like that? I already have enough big blocks, and wouldnt mind running a SB400 in a Blazer of mine.