So if i'm getting a S/C should I get the 58mm
bbtb, or the Barney 61mm bbtb? Will there be a difference since it won't be NA anymore?

 

i remember reading somewhere that most superchargers come with their own TB
you should really think about where you are going, then decide what fits you best.
if your going to get a super charger that does not include a TB, just get your stock one bored or send it to onpol. your car is going to be with the mechanic anyways.
but if you want to take advantage of the TB that you end up getting
you must get the IM bored.

 

What other options do I have out there for a supercharger? I know there is a rimmer and a alphine(eaton). Any others?

 

CAPA makes one for the tibby, but they use the apline/eaton blower.

The Apline/eaton unit uses the stock TB...so a bored out unit works.