Our next two builds will be knuckles. Don't know which motor will go in which bike yet. The 39 (top) came out of the Love bike; Rich and I had it apart last year so it's ready to go and will probably be the first choice.
This 48 motor came out of the original Tacoma; we replaced it with a rebuilt pan (see earlier blogs). Its a nicer 'dirtier' looking motor that might suit the dirty Japanese style we're looking for but it needs going through first.
Either way, we're going knuckle.