6at cummins from a UPS truck. Same size as the 223 in physical dimensions. In fact with a couple of easy mods to the hold down bolts on the cummins, the 223's valve cover would bolt right on making it look like an original Ford diesel. It's a much smoother running engine than the 4bt, and it bolts up to any gm tranny. I have one in my 54 gmc dumptruck and one in my 59 f350 flareside. A friend converted the jimmy when he owned it, but I did the Ford Swap. I'm always blabbing about it. My build thread was 'kinda like a hotrod, but it isn't hot', or you may choose to view my youtube video '59 f350 with cummins 6at'. Almost seems you had to be hiding under a rock last winter to miss all this the way I was about it. Well here it is again......