Frame specs for 67-72 Chevy shortbed

I know it has probably been asked or posted before, but I haven't found it. But I was wondering if anyone would know where I could find the frame specs to build a stock floor frame with out an original frame. I don't have a frame to start from and find it pointless to go out and buy one just to measure and turn around and sell it. So if someone out there could help me that would be greatly appreciated.

I think the stock wheel base is 115 inches you should be able to figure out what width you want from the body mounts and stuff

I don't typically reference the stock frame for anything, because quite often the stock wheelbase isn't what looks right in the fenderwells. Most of the time, what I do is build the frame to the cab with a makeshift framerack underneath it. The frame will need to installed and removed from the body a few times, but that isn't that big of a deal.

So basically build the box under the cab first and go from there??? Cause I'm wanting to run 22's all the way around, but I'm trying to do so without notching the fenders. I know I'll have to Z the front probably 2 inches, right?? But that's the thing, if I Z it, I'll most likely have to cut the fenders and I don't want to do that. I'm doing enough body mods as it is!!!!