Motor home 440s, I like them.
Funny this subject comes up again.
Just watched Nick's garage on u tube dyno a 72 ,440 standard bore and bottom.
Pistons 150 below deck. Left the original bearings , cam ect.
Owner stuck a set of 516 heads on and a 750 holley on a cast intake.
That was it, running through stock cast truck manifolds it pulled 334hp and 402lbs off the crank.
True no alternator , fan, ect.
But that's pretty good .
$750 on swap meet bolt ons your North of 400 hp prob 450 lbs.
Plus you can gas her up at any C store on 87. I fail to see the down side.