After a LOT of experimenting with different throttle bodies, different sensors, different injectors, and different fuel pressure regulators, here is the combo that I am currently running:

• Holley 670 CFM base

• Stock GM injector pod

• GM 80 lb./hr. injectors

• GM vacuum operated adjustable fuel pressure regulator

Here is a pic of the throttle body.  It shows the Holley base and GM injector pod.

I rewired the throttle body with new injector connectors and I added a Weatherpack 4-Pin connector.  This makes it a lot easier to disconnect and reconnect the throttle body.  Also, This way I can switch throttle bodies a lot easier without screwing around with a soldering iron redoing all of the injector wiring.

The stock injector pod that came with your car is just fine to use in a high performance application.  Everything on it/within it is changed though (injectors, AFPR).

Here is a pic of the injector pod with nothing installed in it/on it:

Anyone with a TBI car with any mods knows the importance of fuel pressure.  The problem came when adjusting the fuel pressure at idle and at wide open throttle (WOT).  Without a custom chip that is calibrated just right for your mods, it is almost impossible to get the fuel pressure right.

When the list of mods gets pretty big, the need for more fuel usually goes along with it.  The only problem is that at a single fuel pressure, there is usually too much fuel at idle (you run rich) or too little fuel at WOT (you run lean...very bad!).

That is where the Vacuum AFPR comes into play.  This regulator adjusts the fuel pressure according to the load on the engine, which corresponds to the vacuum created.  The case of the FPR has a vacuum port sticking out of it, which you hook up a vacuum tube to.  As the vacuum changes, so does the fuel pressure.  It can go anywhere from 8-10 at idle, to 15-18 at WOT.

Here is a pic of the VAFPR from underneath.  The vacuum port had to be trimmed to this size.  The screw in the middle of the case is the adjusting screw:

Here it is installed on the injector pod:

Here is how I routed the vacuum line out of the regulator, and through the air cleaner base:

I wanted to use GM injectors because of their quality and durability.  They can withstand very high fuel pressures without any problems.  It was a HUGE decision when considering which injectors to use.  After a lot of thinking, reading, and changing my mind, I decided on the 80 lb./hr. ones.  Instead of screwing around at a junkyard or looking on the internet, I ordered them straight from the dealer.  They are obviously brand new that way, which is worth it t me.

Here is a pic of the injectors in the injector pod: