[Wazza]

Just in the process of changing mine from 3.27 to 3.7.

My final drive (6th.) is (I think) 0.68, not 0.5 like yours...so the 3.7 will be spot on for me.

2090 revs in 6th. , will be 110 k.p.h......

I have been doing around 1750 r.p.m. for the 110 k.p.h. up until now, and although the engine has a ton of torque...I recon purring along on the 2,000r.p.m. mark will get it running as smooth as silk.
Cheers,
Warren.