Michael,
My mistake, I was assuming it had the 25mm timing side journal like the earlier 350cc engines. The numbers I used came from some info for a D29, which probably are the same as the 350EW.
If it has the 30mm journal of the later engines, then can offer the following numbers. Crankshaft: length of journal: 1.25", length of taper 1.281, angle included 10 degrees (5 degrees per side.) These dimension apply to the S6 through the Blue Chief at minimum. Flywheel: big end diameter 1.150", length 1-19/32, angle 10 degrees included (5 degrees per side.) This based on a Blue Chief flywheel, but the numbers ought to be good backwards to the S6 era.
Generally, the 'Colonial' models had a heavier flywheel, identical to the standard flywheel but with a half inch larger diameter. I do not have a picture showing what the correct flywheel looks like, but would have thought it used the style with the rounded edge (i.e. not the cylindrical edge like the S6.)
-Doug
[fix typo. 26Feb18]