Well, it always comes down to budget and goals. On the low end of the spectrum, you could bang out a budget street build by finding some explorer "3-bar" 96-97 heads, or the later 4-bar GT40Ps (specific headers required). They'll still run ya only a few hundred from the marketplace. On the extreme end, you could end up with some exotic custom Yates, High-port, or Clevor head. But if you go that extreme, you should be talking to a builder or already know what you're doing. In the middle are all the rest at various levels of spend.
Your suggestion of the B-cam probably means you're budget-minded, in which case your goal is to find a good used head. The GT40 and basic cam & explorer intake combo is a really nice bump from stock. Depending on the other bolt ons, you should expect to see 260+ rwhp and to have plenty of power to carry a full weight manual fox deep into the 12s. A step up from there would be to a premium aluminum head like an AFR or Trick Flow. These heads will flow enough to push power into the 300+ rwhp area and if cammed and properly intaked & accessorized, you can even get into the 350+ range. Look to spend a couple grand on those heads new and 1-1.5k used. You'll want to pair those more premium versions with a Holley Systemax II or similar intake if you stay in the 302-310 c.i. at less than 6.5k RPM range.
That should be plenty to put some 'paint on the wall' for ya. There's nothing wrong with a budget-minded torquey little GT40 combo. That's what's currently in my DD, and I love it! Above that, the principle of diminishing returns for the $$$ applies.
Besides, I have a B cam I may install one of these days....
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