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AFAIK the biggest difference in the Edlebrock heads is a slightly larger exhaust runner, promoting better exhaust flow. No big thing, and definitely NOT worth the purchase price when compared with LT1 heads.
There's other better options than the CC305 out there. Joe Prince did me a set of LT1 heads (ported factory casting in other words) and I had a Comp XE224/230 ground on a 112* LSA thrown in and made 375/363 through mid length ASM headers and a FULL exhaust, including a cat. That was also with a six speed with a steel flywheel (read heavy) street twin clutch. And it would have passed emissions had I put it on the rollers but I never got the chance. Look at my web page to see the dyno graph. Torque out of the yin-yang all across the board and power to back it up.
My recommendation would be to pick up a spare set of LT1 heads to get ported, and then pick your cam and have the porting on the heads matched to the cam you chose. Plenty of emissions legal cams are out there: Hotcam, XE218/224, XE224/230, CC305, Crane 210/224, Crane 222/230 (GM846) will all pass emissions with or without ported heads with the proper tuning (and I don't mean an emissions only tune).
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