Thanks for the input! I'm not looking to spend a TON of money, but I'm not afraid to spend some if the results are good.
There's a well-known cam grinding place less than 30 miles from my house, so they might be getting a call from me.
The big exhaust valve might be do-able since I might have to get the head rebuilt anyway.
I have experience building headers, and it would be a fun project try my hand at an intake manifold. I have an idea about a cross-ram fed by a pair of 300cfm 2-bbls.