Better measure it up, there really isnt a 'standard length' on anything v-drive, Measure from the end of the v-drive shaft to the end of strut and specify that when ordering, you want no more than 3/4" gap between the strut and prop, the less gap the better.
You can Call Glenwood or Rex, there is this wild new thing around called UPS, i believe they can ship to MI for ya
600hp on a 1" shaft means Aquamet or K-Monel for shaft material.