Add pulley to balancer?

[WDoug72]

Hey everyone,
I was wondering if it was possible to add a pulley on the front of a harmonic balancer or would that cause vibration issues? Reason being is I have a 200 with a 3v balancer(factory ac car) and I would like to run an eaton m90. I'm thinking of having the waterpump and alternator run off the two rear grooves ( both have 2v pulleys) and then two front grooves be dedicated to powering the m90. Let me know with what you think. Will

 

[FalconSedanDelivery]

If it fits , its fine , pulleys are generally Neutral ,, and actually the more belts , the more it Dampens Vibrations, on my 671 Blown 390 V-8 , I only use a Hub ( no Balancer / Dampener at all ) the big 3 inch wide belt does it all and has been that way since 1987