Upgraded alternator with eddy heads

I think I've read more in the past week than I have in my entire hi school years. I have a Smallblock with eddy heads and would like to upgrade the alternator. I purchased a 90 amp Denso but its to tight to the head. Now I'm looking at a gm style but I can't find where anyone has successfully done this with eddies, I'm now considering a Ford 3G but same thing.
I was considering a tuff stuff but I've read that they still suffer at low rpm and that is where I need it due to my fuel injection need a good voltage and right now with my stock alt it surges really bad at idle do to discharge.
Any help would be appreciated.