I was wondering if anyone can tell me how to create some vacuum to relieve some crankcase pressure from my car..

I tried to run a Tee brake booster, to my valve cover and it worked for a while, but my brake light would come on at high rpm's, and the car would loose all power at the same time. Later, I found a bad gasket on my carburator, so I changed it out, and I was wondering if the bad gasket on the carburator created the vacuum loss at high rpm's or if the pressure from that added hose caused that.
maybe someone else has a different idea of w hat the problem may be.
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(Gloria[/b])351w steel crank, stroked to a 393 stock rods, probe forged pistons, arp bolts, Pro Comp cylinder heads, victor jr.intake, pro-form 750 carb, comp cam 2700 to 6800 rpms, MSD distributor and 6al spark box, c-4 full manual valve body transmission with 3500 stall converter stock rear end with 4.10 gears and trick rear springs.