Fuel economy issues

I actually have a pretty good inventory of the car, just not the internals of the tranny, engine or rear gear. I installed the EFI and ignition and then went to a shop and they fixed some issues that the car had as well.
The timing curves are completely out of whack as well as the timing of the car, I know that. The engine is perfectly good, great compression, great oil pressure, doesn't over heat.

I hooked up the vac. adv. today and it seems to be working a little better. I still have to adjust the timing curves as well as re-time the car but I think that was the right direction in that sense.

Rice Nuker: I had a factory ignition on it and that was working fine with the EFI and then I moved onto the ignition. I know it's not totally to do with the EFI but probably with the timing and ignition but, you never know.

Your point on the oil leak brings up something I just discovered. I'm getting oil sprayed on the manifold on the drivers side, if you look at the head theres and hole there and it seems to be coming out of it so I believe I have a bad head gasket, any ideas on what this could be?

valentino automotive: The bung is like 3 to 5 inches behind where the exhaust comes together into one pipe (y pipe?).