I'm in a different frame of thought. If the S-code is in reasonable shape and wouldnt take much to get running and driving (safely), I'd do that first and use that as my enjoyable fun car.
Then I'd go nuts on the 66 coupe. Partly because i have a soft spot for them, partly because they are a dime a dozen and I dont mind cutting one up (see build thread)...but mostly because that's what I have.
I'm not sure I could care any less about an "Eleanor". They are overdone and uninteresting to me.