camshaft for mild 340

This one will give you some lope, and still have decent vacuum.
I have it in my 340.

Lunati Voodoo Camshafts 10200703
I agree but this cam does require valve guides to be cut. Or at least it does on my 360 heads! Im going with one size smaller. The lunati voodoo 10200702.
For stock heads I agree with toolmanmike and RRR