Love your car!
I am putting a 1988 5,0 HO EFI in my 62 Ranchero.
I will use the AOD from the same Lincoln Continental.
What headers do you have and how do they fit?
I have considered Doug Thorley's 3-Y but I have not heard of anyone using them in this application.

/Magnus

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1962 Ranchero, 5.0L HO, AOD
1977 Zundapp KS50 watercooled
1977 Zundapp GTS50 5-speed
House with 40 x 24 ft workshop