400's are they any good?

the key word

Yeah, I wish I had a timeslip for our car but, anyways let me know what you think. If you think even stock 400 with a performer intake and good ignition and headers will out run this? Here's the 318 described above now keep in mind the speedometer is off by about 5 mph at 60 mph because of the 275/60/15 tires and the engine does have some blowby and around 185k miles on it?