there's a custom gt2860 kits for sale in the FS section. he hasn't got pics yet but he only wants 1k iirc
or i may know of an ATS gt2860rs kit coming up for sale.
so what igniter have you got? you may need a tacho adapter, i have diagrams of how to make one to suit the gt4 tacho if your running individual coils, but dunno if that's applicable to you.