69 300. I have a Fusey. You said you had a 65 box and I did not know how different it the two were. I do want a non A/C box and if it were similar enough for me to use it I would have bought it. Its a good price.
http://www.forcbodiesonly.com/mopar-forum/showthread.php?18775-69-Fusey-Heater-Box