h/r lincoln-
I said.....with an F class engine, though, it may be more academic than real.
With an F Class engine, your speeds are not going to be in the higher 200 mph range - like 250 mph or so - the production record is, what, under 200 mph... as are the unblown "stock body" coupe classes - being, I think, mid 160s to high 180s mph-wise..... blown though is another story, so to speak - the records are from just over 200mph to well over 250 mph.
The aerodynamics are something that get factored in with exponential ratios as the speeds increase... and please don't ask me to expound on that as it is not my field of expertise.
I did not have accurate Cd numbers on the late 80s Mustangs - only the 79 to (probably) 87 'stangs... and the anecdotal info was from a site to which I had been directed that stated the same .4+ Cd for 'stangs up to and including '93... The reason I was looking into this was to compare frontal areas and Cd numbers of several comparable smaller North American car bodies with the numbers for our Vega...
Okay - the higher Cd number on the 'stang in combination with a smaller front area, when compared to the Lincoln with a lower Cd and a larger frontal area, will at some point do one of several things - effectively give the Lincoln an overall edge, give the Mustang an overall edge or be a "wash"... the Lincoln body is not so much bigger than the older 'stang that, with its lower Cd, I think that you will have an overall "slipperier" car with the Lincoln....