I don't know why they would have to dremmel the TB casting since the AFPR goes at the timing belt side of the fuel rail. The only thing that I can think of is that's where they had to mount the AFPR. I'm not exactly sure since a 2g engine bay is more crowded than a 1g.
As far as which brand is good that fits a stock rail, most Aeromotive EFI regulators will work. Import Evolution has some nice kits that come with everything you need to install. Here is the kit I'm looking at:
Import Evolution
Hope this helps.