A good all around converter for street use is the PI Stallion lockup with the 0 pump (2800) stall. This converter is worth about .4-.5 et. and very streetable. I have the #6 pump and I would call it streetable but my car is not streetable with the exhaust and C4.
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88 347, Twisted wedge heads,Comp Cams 224/230 cam, 1/4=10.718 @ 123.02 mph dyno=
http://www.fbody.com/members/LarryS/mustdyno.jpg