Chevy p/n's Mr 70.?

[Mr70]

Jed & John
That plastic baffle was only known by that part # and used between 1969-72,and wasn't superceded that I can see.Which usually means it saw very limited use in it's day and was not in any demand,even later on in the repro years.
Don't confuse your Nova baffle with the one used on the 1969 Camaro #3949856,which is a diffferent design and was made out of metal as well.
That pic I posted is Courtesy of Gene SC.He has one on his 1970 Nova and may be able to help both you in reproducing one.
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