I think I built the oval track 318’s for 3 years, then the rules changes and allowed 360’s.
I don’t remember exactly where we ended up power wise with the 318’s before we went to the 360’s, but it was solidly over 350hp.
That’s running unported 596 heads, and a stock 360-2bbl intake manifold and a Holley 500 2bbl carb.
When I did that first dyno test between the 596’s and the 302’s with the 1.88 intake valves....... the motor never broke 300hp with the 302’s.