i just got a mustang today that was setup to run a 300 shot of nitrous and it loads up really bad w/o it... i was told the jets in the carb are too big for trying to make this motor run all motor witch makes since

its a 347ci
750 cfm holley carb
not sure of the specs on the cam but its deff a high lift
3" dual exhaust w/ 40 series flowmasters
edelbrock intake mani (i have a 1" carb spacer that i took off)
steel heads off of a thunderbird

can someone give me an idea of what size jets i need to run this on the streets so it doesint load up so bad, i still wanna run a small shot of nitrous maybe a 130 shot