If not GER. what would you recomend?
I've had two TCI's in the car and both worked very well. I would not claim that their off-the-shelf models are going to work as well as a custom, but the converters work as advertised. My 10" was "only" $400 and it's stalling just about where they thought it should with my setup. I did have a problem with the first 10" I got from Summit - the splines in the converter were buggered up. That may have been a TCI thing or an abused part that got returned to Summit. They repalced it no questions.
1967 Falcon 4 door 351C - 70 Mustang 351C
Owner built, owner abused.