I'm going to assume that both the TH350's have a 27 spl output... as I believe that the 203 only came in a 27 spl version behind a TH350.
But I haven't a clue about the 208... crack'em both apart and count splines and check dimensions on the outputs... if they're the same, slap 'em back together the way that you want.
Just my $.02
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brad
5.0L | 435 | 203 | 300 | 4.10 | 39.5
Buildup BACK underway...
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