Well if you want to swap a good one for yours I have two that work well. A 9037 and a 4322 I believe that have just been rebuilt. I run them on my 71 Cuda and my 72 Duster. Both 340 motors
Steve Stills in Edmond Oklahoma has rebuilt 4 TQ’s for me in a weeks time. And all run excellent. He sells and rebuilds on eBay. If you look under thermoquad you won’t miss him. His rebuild service is $165 I believe