My experience with the UR 3 pulley kit was not too fun. The crank pulley was straight forward, and the alternator needed the touch of an impact gun, but the ps pulley was seriously aggravating. It required a puller, and I had to yank the radiator because it was cheaper than accidentally buying a new one. Then you broil the new spindlel in the oven for a half hour (no joke) and quickly and safely slide it on and let it cool.

Just do the crank pulley. I installed these in two stages, and the difference was not really worth the effort, and I'm all about worthless effort! There was a little voltage drop at idle with the under driven crank pulley, and not much of a voltage change with the aluminuim alternator pulley. It's noticeable rolling up into the driveway at night though the headlights.

The factory crank pulley is 11 pounds of cast iron porkiness, an aluminium one, 2 pounds. That right there helped the most.

Save the money and go for the crank pulley.
Have fun..

later, x