In 1980 I did a number of bike deals. I started off with a stock 78 GS 1000N which I sold to buy a 79 CBX. That had clip-ons and poor handling but paint and sound to die for. I traded that for a modified 78 GS 1000 (big bore with 29 mikunis)- I had a pin in my leg which caused me to miss a 1-2 shift and thus twisted the crank. So I did a massive rebuild on the GS.
New crank, aligned and TIG welded pins, Yoshimura 1100 kit, new head and valves, 33 mm mukuni, Yosh StageII cams, GS1100 swing arm and ignition, dual disc front end from a GS 1000S, seat, tank and tail from a GS 1000E (black) anodized blue wire wheels 130 rear (which was huge then) 110 front. Fox shocks (deflected disc design) Kerker KR pipe with the no baffle baffle, fork brace and a GS 850 front fender and GS550 sidecover badges (just to really make people puke).
That was about the fastest bike in town (No BS) in its day. I handled any and all comers including V-Max, GS 1100, GS 1150 all kawis including a for-real Lawson bike and a FI clone. I can remember people being amazed by the bike pulling wheelies and putting down stripes at the same time. One guy on a V-Max could not believe it when I run up beside him at high speed, looked over at him and waved goodbye. My buddy who was chasing said he was pulled over on the side of the road looking at the bike with a seriously pised-off look when he passed.
It ate chains like they were free and I usually ran two or three rear tires every summer -and that is in Edmonton, Alberta where you could only ride fom May - Sept (thanks to global warming the season's a bit longer now).
I still dream about that bike, although I would imagine riding it today it would feel like a turd.