I'm pretty confident the TBI only needs 34 PSI to run and the later magnum "kegger and rail" intakes needed 58 PSI to run. But I don't think it's going to be optimal deleting the EGR. The factory TBI 360 intake is not a bad piece, and if you're going to run TBI, I would advise staying with it. Those also have a large coolant loop in the bottom of the intake and I'm fairly certain the TBI setup needs the extra intake heat for proper operation. It's not going to perform anywhere near as good as a carburetor with a proper distributor curve, but it's definitely good enough if you're wanting back and running in a hurry. Also, bear in mind that if deleting the factory computer, you'll have to put a conventional voltage regulator on the alternator or go with an internally regulated one wire alternator and external charging loop. The charging is handled by the TBI computer, and if it's setup so that if the check engine light bulb is pulled, it bricks the charging system. Needless to say, they don't take well to anything else being disconnected either! If he chooses the air gap route, an out of the box 650 AVS2 is very near absolute perfection for it. I promise recurving the '75 distributor and going with a carburetor and the air gap is absolutely worth it. IF that's a hydraulic roller cam LA 360 out of that truck (usually heavy duty, ram charger, and 3/4 or full ton van) and he or you don't want to hold onto it, post it up here to sale... Those engines make a great starting point for almost any 360 build, someone would be glad to get it!
