every place that i have gone to about replacing my stock pulley with 3.4 zzp mps has told me that they have either no experiance with it of that they have good reason to believe that it would break the blower while doing the swap... is that true? is my sc at risk here? or should i just keep looking for a place that will do this thing?

Join the chapter of Club Grand Prix that is closest to you -someone on there I'm sure would be more than willing to do the swap for you, for free or a case of beer at most.

Off hand I can't say I know of anyone here on BC within 100 miles of you that has a M90 pulley puller.

And to answer your question, the odds are some shop who has never did a pulley swap on a M90, will probably break the nose or bend the shaft.

Pulley damage is the greatest concern and risk. Get the proper puller and the proper help if you can. The proper puller is a REQUIREMENT. Help is optional but strongly encouraged.