You must race at a slow track...LOL
I've been running one on 5 cells for a couple months and geared way tall (5.2-5.8 fdr) it's competitive (like DEAD even) with the intermediate guys.
I run 6 cells with it in the local P/L races and there's ALWAYS someone who kills me on the straight. It's better than a bad stocker, for sure, but not as fast as a good one.
Percentile-wise, in the total population of "stock" motors, I'd score it 90-95th. I'm sure EddieO or Big Jim do faster stockers...but you're not going to get one of those for the price of a 4300.
You'll definitely be faster from all the extra laps of practice you get.
Of course, then they'll just say it's the motor.