do i need to recalibrate if i get new headers and also if i get new cylinder heads

 

Definately need more information about your car to be specific.

On carbureted cars, when you make a significant decrease in backpressure it will lean out your mixture in most of your driving RPM range.
With fuel injection or computer controlled fuel delivery, you might as well flip a coin before you second guess your A/F mixture.
The most reasonable way to tune (assuming you don't have a wide-band O2 or lamda sensor) is to use an acellerometer like the vericom or g-tech. Do the test runs and play with the A/F mixture looking for highest trap speeds.
That way you know for sure what your car wants in the way of fuel.

 

i have an 85 i roc z camaro 305 tpi v8 engin code f

 

o ya and i do have an o2 sensor

 

Ok then your system will pretty much adjust itself during normal driving and my only go a bit lean at full throttle, but that's usually a good thing for power.
At the very most you may try changing the fuel pressure while you're testing full throttle runs via track or acellerometer.
Chances are a fuel pressure change will be of no benefit. And definately do not switch to larger injectors on a 305.
good luck with that.

 

"to the intellagent people of the message board" -- what an odd statement. SPELL CHECK!

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1987 Midnight Blue Camaro IROC-Z, 350 TPI out of an '88, Accel 8.8 wires, hypertech air foil, flowmaster american thunder 3" dual outlet cat-back... slipping tranny!! (T5 swap next spring!!)
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i am not that much of a speller or a reader at that so i really don't care