400's are they any good?

im actually running the same smogger 400 and summit cam with headers a performer intake and a holley 750. i made one free pass a few weeks ago and my mph was pretty close to his. traction was non existent for me though and i ran a 15.4. i think mine should go 13.9 but im going to need a good tire. even with the 750 i was thinking even being so close to stock, it would still like more carb, i used the performer becasue i only had the 666 square bore iron intake and i wanted to run a TQ i tried and it was like an animal when the secondaries opened but i had to ditch it for other issues. im thinking it might take an intake swap to an RPM to get me there, but i need tires first.
this wasnt built to go fast. its a cruiser and was a temporary mill to figure out what i want to build. i would havce gone with a different cam and definitely not the performer if i wanted to go fast. i put almost 5,000 miles on it from when i put it in and drove it for the first time in june.