You need to determine what pressure the fuel injection needs to operate correctly. Then you can make sure you get the right pump. Try getting the fuel pump off of the impulse. Are you getting the complete engine from the impulse or just the head and fuel injection? We ran into a snag on the opel injection project cause the distributor from the original engine won't work. The fuel injection is set up to use a mechanical advance instead of vacuum advance.
Also, you need to make sure you get EVERYTHING that bolts to the engine/chassis for the injection. If you forget one little component, it may run like shit, or not at all. You may want to get throttle linkage/cables, brackets, bolts, and nuts. There is gonna be alot more to it than I wanna do so GOOD LUCK!!!!!!!!!!!