Here is a list of flow bench tests on several heads and although the 882s have the lowest volume in the runners, they flow pretty good and are said to be good for low rpm torque. In these times of high gas prices maybe they are reasonable to use for the street because they are from a previous detuning program during a previous gas crisis in the early '70s. I am going to try them for a while and check the mileage as well as seat of the pants acceleration, but I am not aware of a direct set of tests of 1/4 E.T.s for the same car with different heads and no other change, but some magazine may have that too if you do a search.

http://chevyhiperformance.com/techarticles/41598/

Don Shillady
Retired Scientist/teen rodder