CAST IRON 4 SPEED TRANSMISSION HELP

I have 3 a body 4 speed transmissions I am wanting to sell sometime in the future but I don't know what they are worth, I was wondering if someone could tell me what the most I could expect to sell them for.
1. 1968 Hemi Cuda 4 speed that I was told came out of Sox 7 Martins Cuda, I bought it in 1973 to carry for a spare. It was sold because it was cast iron and they wanted a aluminun one to save weight. I never used it but carried it for many years as a spare. It is a factory crash box and cannot be shifted slow. could be converted back to a regular shift. Its in good condition as it hasn't been used very little or not a all.

2. Hemi A-Body cast iron crash box that was modified by Liberty, it has been modified to be a 2.77 ratio first gear and has large heavy duty dogs in it for shifting. I used this back in the 1970's and 80's it in in good condition.

3 Cast iron 23 spline input shaft 3.08 first gear transmission, that I made a crash box out of (cannot shift slow) I used it in the early 80's. it was modified by me by removing every other dog to aid in speed shifting, it hasn't been used it many, many years it is in good condition but not perfect, it could be converted back to a regular shift if someone wanted too.

I would like to sell these for as much as I can fairly get for them and help would be appreciated.