Pulley's or no pulley's???

I am considering buying pulley's for my 97 Cobra and have been reading both positive and negative posts about them. I understand that you can gain a little hp but I am not sure if I want to sacrifice AC and charging for just little gains. Any advice? I was looking at the BBK ones.
 
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The 5.0's are the ones that have issues with charging and overheating using pulleys...the 4.6's don't have any issues with that...Mine used to run at the beginning of the M in "NORMAL" on the gauge and now it runs at the end of the M...nothing to worry about and the pulleys will give you a nice 5-8rwhp...