Just how quick were the 273 Commando's in the Quarter-Mile.

Put a 273 in a go cart and I bet it would be plenty fast...

Or put one in an early a body which is essentially a go cart & you will be quick. Get rid of the bullshit early-a exhaust manifolds & you will be fast.
Everyone has documented times from the early days which were fast for the time.
Add modern rubber, tuning, and a few other basic mods that everyone else has done to a SB except to a 273 because their production run was limited and you will have a quick high revving exciting little setup.