Ken it is a very tight fit even with just the A/C and no heater core. I couldn,t get mine to fit till I moved the A/C coil tubes to the drivers side and that left me with nothing on the passingers side then it fit but it was still snug. Ben was having issues with his too, he has the same set up as you. hope you can get this in with out to much messing around I am thinking there maybe some mods required by a rad shop to add some length on and turn the tubes so they face backwards / towards the nose.