Sorry Steve, what's "abc"? (Z1A/B/C?) The owner (another Steve, who bought my GS1000) has over 40 bikes, including some very famous Suzuki powered race bikes worth in excess of $100K each.
He bought the Rickman with the intent of pulling out the 'Zaki engine and installing a GS1100 (16 valve) engine, but he's a busy man and doesn't have time to do much wrenching.
I did think about offering to do the engine swap for him and buy the Z1 engine, but I only speak to him now and then, (he lives one state over) so I haven't mooted that idea as yet. I think the engine has had the Yoshimura wand waved over it too, I think the Rickman was either a race bike at one stage, or it was owned by a racer, I can't remember.