If you can get some Lucas plate type injectors, those are probably the best on the market and will flow the best at up to 80% duty cycle. Also, figure out how much power you really want to get out of the motor first, if you plan on building it or just plan on running 8-10psi on stock internals. This will allow you to determine what injector size suits you and can save a future switch.

It is much better to go bigger than needed and have an injector loaf all day than it is to have it barely adequete and run at 80%+ duty cycle. Spray patterns and consistancy of fire will become inconsistant and the stress can also lead to premature injector failure.

Just something to think about.