You can build a 470 or 500 ci with a 400 block. 550 -700 or so HP. easy 10 sec 1/4.
the low deck will provide better header fit in an A-body. plus it will be a tad lighter engine.
and if you gear it right and get the suspension up to snuff it could go 200 mph.
It's easy to build a death ride, I would get the chassis up to snuff before putting the HP to it.
Don't get me wrong cubes are king. But I built a 30 over 440 that ran 10.40 at 126 in the 1/4 on 93 pump gas. The car was a 3400 pound with me in it 73 dart swinger. Also that was with little tuning and the wrong sized torque converter
