You never know Ron, those barrels might have come from an old race bike, one of Pops Yoshimura's tricks was to bore holes in the fins, which increased the surface area for better cooling. I bought an old Suzuki GS1000S race bike for 500 bucks "sight unseen" a few years ago, when it arrived, it looked like it'd been pulled out of a drain and leaned up against a fence (in long grass) for a few more years. I was pretty disappointed, but the engine turned over, at least.
When I eventually stripped the engine I first found a set of mint Yoshimura race cams, and with the head off, a set of Yosh 1085cc pistons, and I found that the fins on the barrels had also been drilled, and of course everything that could fall off or unwind had been safety wired. I eventually sold the cams, pistons and barrels for about 3 times what I paid for the bike, to a well heeled American on EBay. I think it's also got a welded and balanced crank in there too (roller bearing crank) but I haven't stripped the cases to see if the gearbox and clutch have been modded.
I've drifted a little off topic, (as I'm often wont to do) but anyway, well done mate, it's looking sweet! Cheers, Terry.