A 63" rear D60 would pair up well with a 65" F150/BB D44, other than the pattern mismatch, 8-lug versus 5-lug. Or maybe we're assuming you have a full-float D60 when you actually have a semi-float version, in which case the wheel pattern could be just about anything.
Regardless, the only way you're going to squeeze a 63" to 65" WMS to WMS axle under an EB is with very deep BS wheels, otherwise plan on flares and some tire stick-out. There have been some good threads showing EB's on full width axles, including both the 1/2-ton and 3/4 or 1-ton variants. The 3/4 and 1-ton axles tend to run about 68.5" WMS to WMS FWIW.