Anne, please bear in mind that my experience relates to a 411, which will similar to a 409/410 may not be exactly the same, (the 411 used many suspension parts from earlier cars). So I don't think you should view 5" as a definitive figure for ground clearance.
Also wheel and tyre size will make a different to ground clearance. The 409 was originally shod with full height profile cross ply tyres, which have a taller side wall than modern reduced profile tyres.
I think you should focus on making sure that the front suspension has all the correct parts and then see what ground clearance you end up with rather than working to achieve a particular ground clearance.
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