sure grip for 65 dart

Guys I need help here. Ive been looking every where for a sure grip for my 65 dart. Mine is the 7 .25 in a 279 gear i think. There has to be a sure grip somewhere out there that will just bolt right up into my car. A 3.23 would be nice but ill settle for the 2.79 gear as long as it a SG. PLEASE HELP! Im so desperate Im ready to buy a honda civic!:BangHead: