I have the PI Stallion #6 pump (3200) in mine with my C4 transmission. This is all I can go and make it to the lights at 126 mph. If you hit the lights at a slower mph you might want to go with the #7 pump(3600). They are about $695. Definitely a good converter!
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88 347, Twisted wedge heads,Comp Cams 224/230 cam, 1/4=10.516 @ 126.27, 60' = 1.446
http://xs-fx.com/raughammer/larrysample.htm