Series II boxes do not have syncromesh (not an issue, you will just have to learn how to double clutch..). Effects on gas milage and such will not be noticible (I think first gear is a slightly different ratio but 4th is still 1:1 on both..). Clutch slaves are in slightly different positions, but I think you can use the II slave in a III without any hacking of the frame (I think going from a III to a II and if you have a II frame you need to do a little modification... I will let someone else confirm this tho).
There is some debate that the late IIa's are more robust than the early II and the III but honestly and truely, in my opion anyways, there really is not much difference. I have had both in my truck (came with a IIa and after the third gear stripped, I put a III in mine, gotta love syncromesh for the gf...). This is one good thing about the Series trucks, you can use parts from a wide range of years.
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Andrew Barr.
1972 Series III 109.
"the Tin Turtle"
"However, that was his ploy and I caved....totally caved...   LOL!" Jellijo 
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