Does anyone offer a bolt up tank that is the larger 3-3.5gal sportster style tank. Or can direct me to someone that can modify a sportster tank to fit a 94 softail frame?

This is the look I'm going for

 

J&P Cycles or the Drag Specialties "Fat Book". If they don't have it, somebody will have to make it for you

 

Ebay, Custom Chrome, J&P, Jireh Cycles and about a half hundred more places sell them. Most common will be the universal tank and you make up the mount tabs.