One of my friends has a six cylinder 68 Camaro (that he got for a graduation present in 69, always with a six). Several years ago it was running 10s in the eighth with a transbrake and another friend was the first in our area to get a rear engine bracket dragster, dialing in the low fives. We LOVED watching those two! They were both very consistent and you never knew who was going to win. The one with the dragster wouldn't even bring his idle up until after the other guy left!
This was at a very slick track and the most consistent car I ever saw (and ran against! He had my lunch more than once!) was a little rear engined, narrow tired, flat four VW powered dragster that runs 7s. Deadly, deadly, deadly. I think he said he burns about a quart of gas a run. It has a Powerglide adapted to it in which they cut a notch in the top of the bellhousing so they could mount a Chevy starter on it facing backwards!