The B cam doesn't rock the house until over 3000, on a carbed car the powerband of the b cam seems to be up to 6000-6200 rpms, especially with 1.7 rockers. It does have a noticeable idle at 750-800rpm, I set mine at 950 and the lope is a lot less noticeable.
Emmissions testing would be a problem with the B cam.
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