Discrepancy between production numbers and VIN for 65 Barracuda

My lack of knowledge on the slant Barracudas! Owned 2 V8's and thats what i learned BTI...before the internet. Thanks for pointing that out. I always read that as valiant barracuda, now i see that 1 8 is a slant Barracuda. Never noticed the Plymouth Valiant/Barracuda 'V8' on end as its not reported on some breakdowns, ie.
1965 Chrysler, Dodge and Plymouth V.I.N. Information

Also some sites claim so number is sequential number off line. That doesnt work in my case as I have 100001 and a build date of April 1 on a 65 "S"? I would think a 001 car would have a build date of aug 1 for new model year? Plenty of stuff out there thats open to debate, but looks like your V8 is accurate, thaks!