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

Engine masters did a comparison of two 500 hp engines, a 372 sbc and a 454.
I'm away from my recorder at the moment, so this is from memory, but I think the 372 made more torque per cube (445 or so?) but at the meat of the torque curve, the big block made more than 100ft/lbs more than the small block.
The kicker is..... at the end of the episode, they threw in a joker, a tired, smoking, almost stock low compression 440 with log manifolds.... and a single turbo.
It made 514 hp, competitive with the other two engines, but it also made 660 ft/lbs of peak torque, a hundred more than the bbc.......
And 1.5 ft/lbs per cube.
Just think what could be done with a fresh engine built to exploit the turbo.