I contacted Langdons about their adapter plate so could install a TH350 into my '50 chev. I currently have a later model 235, later driveline and rear end. They suggested I stay away from the TH350 tranny and move to something like a 200r4 or 700r4...what is wrong with using a TH350... that's what I want to use and there's so many available in my area. I'm perplexed because I thought this combo was used quite often. Thoughts?