1970 1971 383 4BBL Intake 2951666-1 & 2951666-2 ??

I am trying to help a friend find the correct factory intake for his 1971 383 4BBl Dodge Charger. The correct part number for the intake is 2951666. The problem is there are two versions of this manifold a 2951666-1 with two slotted carb openings and 2951666-2 with 4 round holes for the carb. My question is one of these for the 1970 model year and the other for the 1971 model year? Or is there some mid-year change or overlap? I have attached pictures of the different 2951666 intakes that I found on the internet.
Thanks! MJ

My end of April 383 has the open intake.

End of April 1970 for the 1970 model year or end of April 1971 for the 1971 model year?
Thanks for the reply!
MJ

Sorry, end of April 71.