I installed my 19mm Race today. Fabbed up the intake using a stock Motron exhaust header, I had to take down some of the fins so the curve would work right, but all is well. I will post photographs as soon as I get them!
Also, I tightened the Stock clutch springs a turn and a half on each one, I think there is still a lot of room for improvement on the stock clutch. How tight can those springs be pushed? or should I be looking towards the Paz clutch springs, something in that direction? Stock 3 Shoe from and Astro-Daimler.
The 19 is working great, bottom end has a bit more torque and top end has improved head over heals (brought a smile to my face just as big as the day I put it all together).