Converter lockup

See the links below. Can someone more knowledgeable about auto trans than I am tell me what is better and why? I'm going with the 2004R with Wilcap adapter behind the 340 in my Dart project. The trans is from an 86 Monte Carlo SS and will be rebuilt with aftermarket parts to toughen it up a bit. I am not that familiar with auto trans and lockup / non-lockup converters. I've had people on both sides tell me what I should get. All help is appreciated.

B&M Converter Lockup Controls 70244
TCI 2004R/700R4 Lockup Wiring Kits 376600