Rough idle

Idles rough is normal for some cams.
Some cams want some idle-air bypass.
What were your cam specs again?
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But I agree to check the plugs, you may have killed them.

150rpm drop going into gear is still too much. You may have a tight TC; what does your TC stall at.
But more than likely your fueling is still off. After you get it a lil closer, you will be able to take some more timing out, and then it will get better.
Try this; introduce some dry air underneath the throttle blades and see if it smooths out. But be careful, if the rpm goes up, you will have to bring it down with timing retard else the test is not valid.
To do this, I use the PCV circuit; cuz I mean it's right there and in the right place,lol. What I do is install a variable orifice brass fishtank air bubbler adjuster in addition to the PCV, like Tee it in, and then fire it up. Then I give it air bit by bit, and subtract timing, and or throttle-opening, as I work it out; Always being careful not to create a tip-in hesitation.
You don't need the valve. You can Tee in a length of hose and drill holes in it. Or Tee in a multiple-nipple vacuum tap, and work with the openings it has. It doesn't matter how you get the extra air in there, but if you find that it works!, then you will have to figure out how to give the carb, that amount of air. But one thing I do not recommend is to introduce dry air into the secondaries; They must close up tight but not stick.
Good luck.