Are 586 small block heads any good?

586 heads are fine, if you can knock down the EGR bump in the exhaust port ceiling, even better. Should already have hard seats. on a tangent: Vizard took a stock 4bbl GM intake, did a little casting cleanup and port matching and recontoured the plenum dividers and got an intake that flowed as good as "any aftermarket intake out there" for his valve lift. So yeah, the stock 340 intake is even better than the GM so they are no sloutches. To say the LD340 is better than lets say a Peformer or a stock 340 intake for a .440 lift cam? Debatable. I bought one for 75 about 5 years ago and sold it for 125 2 years ago...and my wife thinks Im losing money on this hobby?