Wheelbase on vin number?

[bguild]

Well I am making a Porterbuilt air ride, lsx truck so it will be far
From original. I am not sure numbers matching will be a huge deal. my main concern was if there was an easy way to see it was a long or shortbed by VIN. I don't have a spid anyway. I have a small window 67 cab and I don't care for the small windows. I figure if I could fine a 1968 cab the. I would just swap to that since I am having troubles getting title

Thank you so much for all the help!!
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