I'm running a 800 AVS on a Performer thats done up, mated to a high lift 440 4spd w/3.23's. It's my "cruise" induction system. on a RB its super easy to switch out the intakes. I have a racing WOT induction too. That has a port matched RPM with a dialed in Demon 750. It is up to what your doing. If you're driving around go with the edelbrock AVS. If Drag racing all the time use a 850 DP.