David
I love originality and went to a lot of trouble to get my original air cleaner to fit. Could i suggest you try and borrow an original unit and see if there is any way you might get it to fit ( eg machine the top of the inlet manifold or cut out part of the base of the filter canister and raise it which will lower the unit overall ).
As I said I know little about the earier V8 cars but a quick look at photos on Google indicates the 408 had a smaller but higher unit than the 410.
By chance how thick is the gasket/ block between the carbie and the inlet manifold. I found a very thin but effective one made by Holley which did the job.
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