I grew up around Chevy 6's, on our ranch, as a kid, and always liked 'em, and kinda stumbled upon a few speed parts over the years, so when I saw a twin-carb Offy intake hanging on the wall of a wrecking yard going out of business, I bought it. I already had one very similar, but what the hell, right? When I got it home, I found that it was 17 5/8 c-to-c on the outside runners, while the one I'd been using (that fit) was 17".... I've been told that GMC is 17 15/16.... I wondered about it, and looking a bit closer, I found a casting number... 5588. I actually called Offenhouser, talked to a sales rep, and he told me it was made for the "metric-ized" stovebolt engine Toyota built for the Landcruiser, using tooling they'd obtained from Chev, when they went to the newer inlines in '63.... Anyway, I've been told that that info is wrong, but its all I've got. IF its true, what chance do I have of finding someone interested in THAT? I don't really want to cut-and-weld on it, so I can use it, and REALLY don't want to hot-rod an old Toyota engine, just to put it to use... Ideas?