I have transplanted 1993 ford 5.0 engine with 5 speed world class t-5 into a 1965 mustang. I utilize the wiring hardness from a 1993 cougar, the throttle body, egr, and everything from the top of the engine with exception of fuel rails and injectors was taken from the cougar for the top of the mustang engine. Additionally the O2 sensors for the cougar were also utilize. The car is time at 10 degress before Top dead center for timing. The problem I'm having is getting a smooth idle. At first I tried a new Mass air flow sensor but I get the same results that had with the old one. The engine does run alot better and will come to idle better with the MAF sensor unplugged. I need to get 48 PSI across my regulator due to installing a MSD fuel pump that puts out 80 PSI. I order a 35-75 PSI regulator from Summit to adjust the massive pressure of the fuel pump. I have not put a gauge on it yet but plan to. The Left side or driver side exhaust does not get hot like the right side. Probably due to the pressure not being around 48 PSI and the left bank eating more gas. I did notice the throttle body on the engine before I swapp it to the 93 cougar throttle body had the middle hole out and the cougar had it filled from the factory. The gaskets for the trottle body both have the hole. Any assitance will be deeply appreciated. I cant wait to get this Mustang on the road please sent technical guidance to put me in the driver seat soon.