Flywheel:
Get the flywheel and forget abou thte trigger wheels. You'll be happy in the end. It really is one of the only "fit and forget" options. Zero possiblity for things to go wrong or need tuning.

Injectors:
Don't over size to your needs or just get the first ones you get hold of. 475cc/min is quite a lot for a 1.6cc engine unless you go over 300bhp. Cossie's 311cc/min is on the low side plus usually 15 years olds.