Sorry no info but I do know where one is sitting with a factory 4 speed. I've been trying to buy it for 20 years now and he won't sell. Sad to see it rotting to the ground.
The info I have says that they made 101 Valiant 100's ( 50 4 speeds and 51 auto's) and 245 Signets (82 4 speeds and 163 auto's) that year with the 273 4bbl. Grab it!
Thanks, Mark