Hello all! I'm the proud owner of a basket case 69 GS Stage 1. It doesn't have the original block. It's a 430 block. The heads may be the originals but I don't have them off to check. Engine and trans are out waiting to be split apart and the engine put on a stand for break down. Questions: 1) How hard will it be to find an original 400 block? 2) if I can't find a 400, would you scrap the 430 and just build a 455? Why or why not? I can't think of any advantages or reasons to build the 430. It's been locked up since 1978! If i find an original block I'll restore. If I don't, I'll resto-mod to Pro Touring type set up.