640 tnt engine cowl wanted

I'm looking to find an engine cowl piece that fits a 640 / 775 engine that looks like this.  I'm building up a 640 that looks like a tnt engine with the dual carbs... but need that cover to make the manifold fit.
Some people say that the 73 bullet 440 had the same cover... but I'm not sure I believe that...?

Thanks in advance for your help.