I bought a 72 GMC 50 series last Saturday. It's a one owner truck but will need a lot of work to get going again. Supposed the small block v8 isn't the original engine and is suppose to be bad. Trans has been robbed out of it. Is there any way to pick apart the VIN on these to find out of it originally had a 4 or 5 speed and what size engine it came with? I'm pretty sure it would have had a 350 but I've seen some around this model with the 307. Mechanical parts don't scare me too much as I have parts on hand, however this truck will need other stuff like the grill which is unique to GMC and I don't know how tough that is going to be to find. It's a truck that has local history and I hate to send it to the shredder. Any help is appreciated!