The 4.56's would be a step in the right direction.Cam change should be on the list of things to change and a good solid lifter cam would really help things out.Before you go for a new converter or anything else for the trans you must decide if that trans is what you want to stay with.A 904 and converter would be the way too go,but that's going to cost some $$ to do unless you can get a good used one and you should be able to find one here on the board for sale when the time comes.You'll have to do this at the time you change the cam as it'll be a real dog off the line with the low stall.