Curtis, yes you can run a 150 with the 2000 up pulley. I had one on mine and all I done was mounted the tire and cut the ends off of the fender strut bolts. Or you can reverse the strut bolts. I did not have any problems with it but got greedy.
Fattire is on the money,I'm about to do the same thing to my Nighttrain and got the same info from Thunder Customs. Just shave the bolts or turn them around. No big deal at all.
BK