I agree. Bullet is usually pretty good on this stuff.
The cam recs sure seems small to get by with pump gas. You got two unfriendly pump gas strikes already with 10.7+ compression and open chamber heads.
I'd figure an intake lobe in the low-mid 260's at .050 and 290+ advertised, cut on a 110-112 and installed in the 108-112 range. Lift in the high 500-low 600's range. It's gonna make good low end torque anyways, no real need to advance the cam.
You can definitely get a custom cam cut that would meet you needs. I'd call someone that builds engines and see what they might say.
