Either motor could be made to fill your parameters.
They're just air pumps.
To know which will work better, I'd need more info on the engine builds.
Also is the 427 ford (Windsor? bbf? fe? or ls7?
Fwiw: I'd lean to the one that made use of the fact a cobra has a bonnet scoop.
It's not a real S/C cobra unless it has a bonnet scoop.
