decode frame vin

[cameyer]

I was crawling under my 1964 k10 and I found number stamped in to the frame under both the passenger and driver door. I was hoping someone on here could help me decode what they are, I've always speculated my body was swapped on to a different frame but it would be nice to know for sure. so here are the numbers under the driver door is 3820303 12 6 24 78 and under the passenger door is 3820304 12 8 21 78 and up under the hood towards the front of the engine is 114 anyone know what any of this means?