Thanks guys, I appreciate the support.
TG mentioned the gearbox and just a little news on that. I have found that until the engine is fully up to temp it will sometimes pop into a false neutral after a downshift 4th to 3rd. Of course this is always immediately evident when there is a sudden loss of engine braking (whether or not one uses compression braking, which isn't the point) Further, twice it actually slipped into the next lower gear (after finding neutral) which becomes really exciting entering a corner......
Two things are evident. I probably try to shift too quickly but need to be more methodical and positive on the lever. Secondly, as mentioned once hot the thing is flawless and shifts precisely so ample warmup time is essential. I really like the tighter ratios compared to a stock box though.
I will check it over this winter, maybe stiffer detent springs and a different check on the drum "timing".
Bill yes it's a 550 head & stock valves although I was asked the same 650 head question last weekend.