Cam for torque question

As said that cam will have no trouble with operating the booster.
And it should idle just fine at 600 in gear, 700 in P/N.Your 1000 rpm idle-speed points directly to an error in the tune, and I'm guessing it starts with timing and the T-port sync. But it could just as easily be sucking air somewhere, and you have compensated for that with carb adjustments. Forget messing with mainjets until you get this idle-business sorted out.
Start with a new PCV valve.You do have one installed now,right? There is no simple test of those guys. Well there is but I'm not telling just yet. Ok, you twisted my arm, I'll tell. On a well-tuned near stock combo; Remove the hose from the PCV. Plug the end with whatever fits. Drill a hole in there about 3/32.Start up the engine, adjust the idle speed to about 650 in N/P, adjust the mixture screws as may be required to achieve best idle. Shut off engine, re-install PCV, start her back up. Changes to the idle speed and mixture screws should be minimal. Bigger cams like more air.Your cam might like a 1/8 hole to come up even. Unfortunately, those valves are non adjustable, so you have to give them air elsewhere;NOT the curb idle screw.The T-port sync will reveal the deal. But if you start with a defective PCV, well that just throws a whole big monkey wrench into the tuning regimen!

Now holdonasec
As to the low, idle, in-gear vacuum; A while back, there was a fellow here that had a similar idle issue in/out of gear, and it turned out his TC had gone sour, and it was dragging the idle down. Now don't confuse this problem with anything so far said, by anyone; but if, after putting a decent tune into it and it still drags the idle speed down,THEN this is something to consider.
OOps I see cracked post#11, already mentioned the TC idea

Ok one more thing; what elevation are you tuning at?