Conversion complete.
He got the typical Vortex rear sprocket (+2) and went down a tooth on the front. I was wrong about the bike he had, turned out to be an old F2. Not bad shape for the year and mileage on it. The original chain was so stretched out the adjusters were backed out all the way it he still had a heap of slop to the chain.
That Vortex sprocket is considerably lighter than stock, but I can just see the teeth grinding down if not taken care of. He reported back the ride is very smooth now that the chain is adjusted properly and the acceleration is like having a new bike.
Total time 2-hours. Total cost for labor… A 6-pack.