The driveshaft will be different. I believe the trans mount will be farther forward, although admittedly I switched back and forth between a TH400 and a 700R4, not a TH350. The shifter linkage will be different. Basically everything.
You'll also need a new converter and you'll have to rig up some sort of converter lockup switch, or covert yours to a non-lockup converter and trans.
You'll also need a throttle position cable, which is similar to a kickdown cable, but much more important for the 700R4 since it controls shift points, firmness, etc. On the 700R4, the cable is not optional, it's mandatory.
I would also recommend an oversized dedicated trans cooler.
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