I decided to go back and re read the original post, just to see if I missed something, what I conclude is that for a mild 318, the rest of the car is extreme overkill, an overdrive trans is fine, that's a good upgrade, but a high pressure fuel system and a Dana 60, full TTi exhaust, etc is just way more than what you really needed for a 318. I hate the idea that someone has taken advantage of your lack of knowledge and or experience when all you were looking for was a reliable fun car to drive, let's be honest, you got screwed by a shop that was only out for your money, like many others before you, and unfortunately, there will be plenty of others still.
It can be argued that the upgrades made were necessary, but still overkill. Factory hemi and 440+6 cars only came with a Dana when a 4 speed was optioned, otherwise an 8 3/4 was factory installed. An 8 1/4 would likely be enough for your application even. Mechanical fuel pumps are plenty adequate for even multiple carburetors, just my .02, and I am truly sorry that you have been put into this situation by unscrupulous people.