This is why you see a number of GMCs with 235 Chevys installed. GMC rebuild parts are expensive, and not always easy to find. You might have your engine guy check with Stovebolt Engine Co or Patrick's, some parts may be a little cheaper, but I'd say you'll be lucky to get it done for $2200. For that kind of money you might as well start with a 270 and benefit from the added displacement.