Are Speedmaster Heads Good? I've Heard a Lot of Bad Press on Edelbrock 340 Heads Lately

That's in the 1/8. Car went 7.07 with the speedmaster's and 6.6x with trickflows. In the 1/4 the best it went with speedmaster's was 11.35, trickflows - 10.68, on the chip with the 1/4 passes.
The Trick flow flows 40 cfm more where it counts over the Speedmaster, so I would expect a decent pickup on a choked engine.
I bet you're real happy with your gain.