just bought a resto-mod 57 3100 series pick up. i know it is kinda breaking ranks here, but it was time for me. the guy i bought it from didnt build it, im still looking at pictures, on its way from california. it has a 10 bolt rear end, next to the pupkin is numbers either 12345 or 12346. could someone tell me what it is out of?next it has a 350 3 speed, looks to be the origional tranny. i see 2 modules with wires. im thinking one is reverse light sensor, the other one has 2 wires to it. could this be a overdrive module. im sure ill be picking everybodys brain as soon as i get the truck as to engine numbers etc. thanks bill