Adjustable timing plate, milled or cool head with correct domes, reeds, pod filters and ditch the air box. Once you have all your bolt ons, send the cylinders to a site sponsor for porting.
Hit up Wildcard Racing, they carry all the parts you need
Nice find!
Looks like you have most of the basic stuff covered.
In the trans i've always ran Klotz Flexdrive, good stuff
Motor, R50 @ 32:1. If you already have some 927 and want to continue running that, then might as well.
Your going to melt your motor down with those 200's. Start rich and work your way down. 290-300's and go up or down from there. Also fmf's like a larger pilot too, 27.5