Yep, those '77 towers are exactly what I'm trying to find right now, too. I don't want to spend the coin on the custom made ones from L&L. $125 for the rubber mounts is enough to spend. I saw the fenderwell headers priced at $580 and about crapped my pants. But regardless, those are the headers I'm going to run.
Do you know of, or have you found another set of these towers? I'd buy them off you if you do.
I'm ditching the slave-assist cylinder crap steering stuff off my '75. I'm still trying to find that perfect setup for the power steering box. I'm not real thrilled or keen on cutting, welding or any type of butchering on the frame. I bought a kit off eBay to convert these HB's to power steering but not planning to use it because I read about using the 2wd gear boxes puts too much stress on their long shafts. I want a 100% bolt-on kit for this conversion. Good luck with that, eh?
I live in the middle of the wheat state of Kansas and there are tons of HB's used by farmers here. Problem with finding that perfect truck is that most of them have flatbeds and where flatbeds are involved, most are welded to the frames. I got lucky finding my '75 which had a regular bed on it but was still a farm truck. I could only save the cab of which still needs some work. The frame is immaculate! It was the whole reason I bought it.
Right now the '75 is a roller in the shop with the cab, 205, D44 and D70 all on 4" Skyjacker front and rear lift springs. I'm trying to find the HPD60, 460 and C6 along with a rust/dent free bed, doors, fenders and hood. I have an NOS tailgate I got off eBay and its got the XLT trim on it. Best damn 'gate I've ever seen.