I just 2 904's done by him. 1 for the wife's Cuda, simple upgrade & shift kit, mine with a MVB. Told him it was running hard and fast, looking for 9's. He chuckled and said "OK!"
Huh. He told me that they don't get much call for 904s. 727s, yes but not 904s.
My converter did not fit on his dyno adapter, he had to get an OE one from someone else to make it work.
Said they were a dying breed. It's probably true from his point of view, most guys with Chrysler products probably don't consider using a 904.
Glad I did it though. Now I can just bolt the thing in and know it will be OK save for any adjustments that need to be made. I always like to have that peace of mind.