Big block casting#3955961

[the427king]

Yes odd for sure not just because it's the earliest known casting date and single digit vin,but it also has odd looking gussets front and back,and If memory serves me it's a 390hp code on a 4 bolt main block. It may? Be the first 427 ever in a corvette if the first few happen to be small blocks. I never tried to see if that was known information or not but I've had the block for 30 years and never had it for sale due to not knowing if it was the first corvette 427 or not. Bought it at the Thompson ct swap many moons ago