built up 318 oddly low MPG's? hp rating?

The double pumper is killing you. They are not set up for fuel mileage.

Even if you adjust the stuff you can, the PVCR and everything else in the metering blocks are still set up for a fat mixture, and things are only ever going to be so good with that 727.

The car would also drive a ton nicer with a 570 or 670 street avenger on it.

Getting an actual compression ratio out of the motor at this point is going to cost a ton more than a carb. To get it anywhere near good, you would need pistons, and/or a set of heads with smaller chambers.

Those pro products intakes are horrible also. I don't know if its possible for it to knock your mileage down any, but it probably is....

On the other hand, your car looks GREAT. Or at least the small pieces of it we can see.