gap measurment?

[55metalmonkey]

Hi all,
I was wondering if anyone would have a measurement for the original gap/ space between the cab floor and the top of the frame for a 55 GMC ½ ton?
I just finished some fairly serious rust surgery on my cab floor and on the cab mounts and need to know the measurement off the frame that the cab should sit at, I want to be sure that in the process of fabricating and welding that I didn’t shift the dimension too much or at all.
When I took the cab off, the rubber was virtually gone and there was a shim or two on one of the mounts…..can’t be too sure how many because of rust expansion. So measuring before I took the cab off would have been pointless.

I might be wrong but I think that if I’m off slightly and don’t make adjustments when I put the cab back on that it might affect the gaps and alignment of the other panels later on and make more work later on to correct it or back track just to make a minor adjustment.

Thanks