What should i change to get into high 11's?

get a fresh valve job. put the 3.91's in. a new timing chain and degree the cam in with at least 4-6 degrees advanced centerline. this shouldn't cost too much. adjustable rocker gear and pushrods. next a new convertor like said before. then if you're still having trouble with him change the cam to a solid with at least .600" lift and still keep it advanced the same.