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Take a look in the Mustang magazines:  38 and 42 lb injectors sell for between $295 and $395 for a set of eight.  So call it $200 for a set of 4 if you split the costs with someone else.  Brands vary, but are usually Bosch.  I'm going to start with 38 lb injectors at 38 PSI - should be good for about 230 HP at 80% duty cycle and 0.5 BSFC.  Would also be good for ~245 HP at 44 psi.  Note that if NA these will not be working very hard at cruise altitudes.  If turbo I would probably go with the 42's just to keep the duty cycle a little lower.

Ken P.