So for the 287 that is going back in the pontiac I am going to be removing the road draft tube and setting up for pcv. The rochesters I got for the tri power have a large vaccum port at the base that I assume was for brakes or pcv. I know they are supposed to be plugged for the tri power set up but could I not plug one, like say the primary carb. And connect the pcv to that. Or should I just machine a port onto the intake? By the way this is a cast iron intake off of a 57 poncho.