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

My friends car just ran 6.40 in not the best weather at Norwalk and that would be a 10.0’s in the 1/4. 60 foot times aren’t where they should be yet, only shifting at 6400 rpm with his 408 with ported Edelbrock heads and ported super Victor at 3200 pounds. There’s 3-4 things I Dont like about this build that are probably keeping it out of the 9’s. But I won’t get into that. The nice thing is with a top end (heads and intake) like that if and I said if you ever decide to sell it you won’t lose much money on it. Especially after showing what ET’s it’s capable of.