I cannot comment on your specific heads, but a couple of us are running the heads/cam seen in my signature, which is pretty close to 600hp & Tq at the crank.
Idles at 1k rpm with 14" of vacuum and drops about 200 rpm when in gear with an auto.
Great package with good street manners and good performance at the track. Attached is a rear wheel dyno sheet from last fall. This is through a TH400 and 9" rear with 3.50 gears
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