I think it was still used in Galaxies/LTDs/Montereys as late as 1972.
In the shop manuals I have it only lists a 390 up to 71. they only had 2V carbs and used the VIN code "Y" I don't have any light truck manuals but I think the 390 was in the F series trucks untell about 76. It's to bad the Torino didn't have the 429 thunder jet VIN code "N". It would have been about as close as you could get to a muscle car from ford in 73. Neal.
I think the 400 debuted in 72 with the engine code 'S'. I am 100% certain that my buddy's father had a 72 LTD with the 400. I remember rebuilding that engine at 110k mi and putting on a (this will show how long ago this was) Edelbrock SP2P-2V intake manifold. That and a Crane economiser cam (double- )! Anybody else remember those? 'Gas crisis' parts there! They had very small runners for higher velocity and supposedly better economy. It made gobs of low end torque! Just what every land yacht needs!