First thing I would do is rewire the fuel pump and the fan circuit.
The crank rods and pistons are good for 500 at least as said, I assume you have pocketed pistons ?, decide what power you want, and why, can be better having a less powerful but better torqueier motor depending on use of the car and driving style.
Defo need higher rated injectors, with map or chip to suit.
317@wheels is a bit enthusiastic for your present set up, don't overlook the many advantages of a lightened flywheel, performance for the outlay is hard to beat.
tabetha