I bought a pair of 500's from a member over at slant6.org; one was rebuilt, came with a mild performance 2300 stall converter and used behind a pretty stout slant with an A100 adapter. It was pulled for a Th200. I plan on using this one behind the 273 in my 65 Dart wagon. The other A500 was used behind the same slant in the same vehicle but was pulled for the 2nd A500. I plan on getting this one rebuilt to use behind the 340 in the 47. Are there any upgraded valve bodies beside stock available for these transmissions?