New to the site, new project

[58GMCSB]

Hello. I just picked up a 58 (i believe) GMC stepside. The last time this thing saw the road was probably about 5 years ago (as I'm told). This thing has sat in a field for at least the last 4 years. It needs a lot of work and isn't going anywhere anytime soon

The title on this thing is somewhat sketchy. I don't think its stolen, but i think the vehicle has probably went through a couple owners that never titled it (the two i know of are older farmer gents that aren't in great health and have a slew of older vehicles sitting around) and just moved it from one field to another to sit.
Im in FL, the last place this thing was titled was in GA. The guy i got it from tried to give me a 57 title. It does have the ID tag, and by what research I did on it, it appears to be the correct tag but obviously not the right title. He does have a bill of sale from the guy he got it from. But its your standard hand written piece of paper that wouldn't even begin to stand up in a court or an inspection station. The georgia DMV says all i need to do is fill out a form send it, a copy of this bos and $5 and they'll basically send a letter that will enable me to get it titled in FL, but i want to find the VIN.

I can't find the VIN on this thing. nothing on the cowl, supposedly its stamped in the top of the frame about 4" in front of the steering box, not seeing anything there either. I don't plan on this thing being on the road any time soon, but I definitely want to get it squared away before that time comes. There isn't even any place i can see that a vin would have been.

This thing looks pretty much stock. Im guessing even things like the shocks are either stock or at the very least probably 30-40 years old.

Where should I look for the VIN?