help needed with 904

I appreciate your help 318willrun ! Given it's history of being built by a speed shop and only street used for two years with 318 in front and 7 1/4 out back and lost reverse possibly do to bad 1966 stock linkage? Of course Tony is already offered Help and likely it's on its way in the form of some paperwork. I try not to bug him too much because like you said he's got three cars in the 10-second range and that must keep him plenty busy enough. without a crackpot like me asking to many stupid questions. I'm just grateful for the help that he does give me. It was someone like himself that I was thinking that might be able to look at the pictures tell by maybe some of the numbers or configurations that it has been modified or not? Option number 2 is not an option with a budget build LOL. I do have the other transmission that I could try also if I need to.