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If you had already planned on an overhaul (or if it otherwise needed one), Id def do it and incorporate some choice upgrades, esp since it's already out of the vehicle. I'd also install large aftermarket cooler would certainly help it out in the meantime.
The cam I'm currently looking at reccomended a 2000-2200 stall converter.
Like you said above - it depends on how he drives it (I'll add "the vast majority of its road time"). If he doesnt frequently race or heavy tow/haul with it, a 700 or 4L60E can be built to otherwise handle that kind of power. Major areas of weakness are the forward drum and hydraulics - beef those up, it can hang with engines like his. If he plans on doing a lot of either of those things, Id do a TH400 or (if OD is a must for an automatic) a 4L80E with a stand-alone controller.
You should have more than enough engine vacuum.
At that point I'd really consider moving away from the 700R4. Step up to building a 4L80E perhaps
I was planning on it but wasn't 100% sure.
