What would it take to make 1.44 lbs-ft per cid ?

Here’s how I see it, in practical terms…….

However much fuel that 408 was using to produce its peak TQ, you’ll need to use at least that much with the smaller cubes.
But without a dramatically different head/combustion chamber, you’re going to need to turn the smaller engine to a significantly higher rpm to efficiently mix that fuel with enough air for proper A/F ratios.

The two engines aren’t going to have the same power band.