i just got an explorer motor with the gt40p heads, and the intake. Im sorta short on money, can i run the injectors the motor came with (19's i think) with my car;s stock intake setup, maf, etc? also, will it help if later i upgrade to 24's and a tuned 24 MAF? any info would be great, also the injectors did work with that motor, so i dunno it if will maby ok. How about a fuel pressure regulator?