So basically, a uber expensive custom build, which makes less torque than a junkyard 360 magnum, and a soft soggy power curve that would be miserable on the street.
I feel a lot of people would be happy with 473hp out of a 360 with EQ's and a roller cam, don't forget it's torque to the ground not at the crank a 273 is gonna need about two full ratio's deeper than a similar 360. Only real kind of trick thing would be 8 sleeves which could do similar without. Yes a 360 or 408 would make a better street machine, I think this engine in a early A body heavily gutted road race street machine with four gear and some really deep rear gears like 5.13 plus would be a fun car. I bet most people building a built 273 would be happy with a 100-200 hp less.
As for the 2.02, most would have a hard time using up what 1.78 valve could do, If I was gonna do 273 probably would use a pocket ported replacement magnum head.