So, I've been looking for a later model (fine spline input, large output) M20 to swap into my 92,000 mile 71 GS 350 4speed with M21 & 3.08 rear. I'm not ready to pay $1500 for one. If I was going to spend that much I'd go ahead and do a 5spd for a bit more. I've been reading some threads and see that the parts to make my M21 into an M22 wide ratio are only about $615. I know it will take a kit with gaskets and bearings at a minimum so I'm probably looking at $750 just in materials. What is the mechanical requirement? I've only had one manual apart and that was the Mopar NP 4spd in my 70 340 Cuda way back in 1984 when little brother cracked 2nd gear synchro. It worked but nothing had to be pressed on best I remember. Just some snap rings and a crap load of roller bearings that went everywhere. I have built a few motors that haven't flown apart yet. I have installed automatic shift kits, swapped motors, trans, front ends and rear ends. I have a garage and plenty of jacks and jack stands. I'm no pro but I'm not really afraid, more like dread getting into something I'm not equipped to handle. Pressing things on and off would be something I'll have to take to a machine shop but not outside my tolerance. If my ability and tools are lacking, what's an independent shop likely to charge me to swap it? How many hours? Anything else I should look for or do while I'm in there? Is the iron mid plate something that would be needed only if I swap in a 455 later?