At 600 HP and a 3/8 line… That’s likely the problem. I just re-read original post more closely (Sory!), “Stock fuel tank and Lines”, so yeah, that’s the likely culprit.
For me, the car runs perfectly all the time, except when cornering hard. I’m making maybe 250 HP on a good day, so I am certain the issue is the carb, and it’s an old carter. It’s likely that just screwing the Holley to the car and getting it set up properly may fix my issue, However, the float is a $34 dollar part and the carb is apart on the bench, so why not.
FYI, There was an article last year some time in PHR on building a carb for road-racing use and I remember them using modified floats and jet extensions, among other tricks. So I just ordered ‘em. I suspect (assuming the primary side of the carb faces forward) that you could get fuel starvation under hard braking without jet extensions placing the fuel pickup in the center of the bowl, resulting in the typical hard-braking engine stall. I saw this a bunch when the Street car shoot out was at Road America last year.
At any rate, here is the float I purchased, notice the tapered ends.
FLOAT
