Hey JohnJ,
Nice to see someone resurrecting one of the old Kaw 750 twins. I was a big fan of them back in the days when I couldn't afford the 4 cyl. version

My first new bike was a '79 B model. $1999 right off the showroom floor. That was just the start. I eventually owned a '76B, an '80 LTD G and an '83 CSR M model. About the only one I didn't own was the '84 belt drive version.
You've got a good bike there. The engine is darned near bulletproof. I once ran one of mine really low on oil. When I changed the oil, a lot of little metal chunks came out. The bike was still running strong when I gave it away 30K miles later at 88K miles. Go figure!
Keep posting your progress!