The motor is likely to be a combination of both the new motor and the 72 motor's
parts. The tune up specs for either motor may be irrelevant. However.. In tune is
in tune. Take the old plugs and whatever to the auto parts store when you get the new ones.
(to compare with). There will be a casting number on the block, and on the heads, on the intake.
If they are similar you can probably use that as a starting place. The number should
begin with an E for the eightys, D for the 70's, C for the sixties. the second digit is
a number so E4 would be 84. I'm going to bed
The engine number will be tucked away on the block up behind the starter. The head numbers
will be on the bottom part (need to remove heads and turn upside down). The intake manifold
number will be sort of in plain sight (if it is a ford part). The whole thing needs to be much older
for carbon 14 to work. The year of all your parts is not all that important for the sake of a good
tune up. New plugs, wires, and cap. Pertronics "points". change the fuel filter and air cleaner
clean the cooties off your carburator. Time it by seat pressure and sound.