12 Second N/A Slant 6?

What are you using for valves?

I know there's more to it than the valves, but that's a starting point.

Sorry I missed this. Yes. I used stock 318 valves. Since they were longer, I had custom spacers made to relocate the rocker shaft closer to the valves the correct amount to correct rocker geometry. Since the valves face away from the rocker shaft on the slant, the longer the valve, the further away the tip moves from the rocker, so that had to be addressed. But it's all good now.