Hi, Looking to find some advice to understand the what chassis frame I have and whether it will be suitable for 1965 SS Impala. When I originally purchased the vehicle a second chassis frame was included and I was told it was a 1966 chassis frame, however after cleaning up the frame and finding the stamping it my believe that it was manufactured in 1968. The stampings I found are listed as (bold Italics are numbers or letters that weren't very clear to Identify and may be wrong):
90016277 - This was stamped in 2 places at top rear left hand side of chassis rail.
3939185-66282 - This was stamped on left side of rear chassis rail.
11-18-68-1-2 - This was stamped on left side of rear chassis rail. I believe the first 6 digits are manufactured date but what does the other 2 mean also the other digits.

Thank you in advance for any advice or help you can provide.
Impalapete