I've often wanted to build a 200-4r
200's are the poop. I often wondered back in the day why no one could keep a 700 in there truck, and Dad an I pulled a 21' bowrider down to the chesapeake every weekend for years with an 84 Parisienne wagon w/ 2.73's in it, and never had a problem. Never towed in OD of course...until later when we swapped a 3.73 posi in it. 305 never blew, but became extremely tired, and we swapped a 350 in around 150k....This is when we realized what a 200 was. 250k on it, and Dad sold it. I'm guessing 50-60k towing...still on the OG trans when it drove away to be replaced by a LT1 Roadmaster Wagon.
Friend built a 600hp NA LSx 3rd gen Rx7, and after wadding up several T-56s at the drag strip put in a built 200, and probably has 200 passes on it now plus street driving. He had originally intended to go left/right turn racing, but ended up at the strip all the time instead shooting for LSx/IRS record.
Have seen countless 200's go 10's or better in Grand Nationals over the years with no more problems than anyone with a TH350 running sames times@ same weight.
They're definitely the ultimate OD auto trans swap.