Need 3K converter...

I have a TCI converter for sale for a 727. It is a 3000-3500 Streetfight Stall Summit part number TCI-142200.Costs $509.95 new I used it 150 street miles and blew up my motor.Now I have only 4 speed so I no longer need it.I am asking $300.00 with the TCI flex plate.I have use TCI products since the early 90's and never had any problems.

Jim