E-303 idles mean as hell I thought it was a mild cam.

[Hozer 88GTConv]

I have the B with 1.7's (so I get the lift of an E, but the advertised duration of the B) TW heads (not to mention supercharged) and it idles as of three hours ago, via a Snap-on 1222 Engine Diagnostic Computer between 790 and 820 RPM.
I was checking my firing(electronic) efficiency via the O-scope readout and RPM variation per cylinder.
I do have the IAB spacer with a new IAB bought about a year ago. I also have a A3M with a JMS chip setup. I am nowhere near my hp potential on my combo even at 8 lbs due to my oil issue on number 5.
After correcting my oil issue, which I hope is a valve seal, I hope to net somewhere around 10 percent more on the dyno curve.
That's with a B-cam that idles rock steady.
Good Luck... (oh, I have 44 degrees of total advance via the Snap-on too...Trick Flow recommends 36 but oh well)