The next thing i did was have the flow guy calculate the flow of the stock 502 intake. Based on the square inches of the smallest cross sectional area of a runner it is capable of flowing over 400 cfm un-modifed (my head intake ports only flow 360-370 cfm-AFR 315 cn'cs).Armed w/this info i started modifying every thing. There is no aftermarket company that sells a high flow throttle body for the 454/502 mpi intake and no one capable that i could find to build or modify one either so i chose to run it as is. Intake manifold-being the stock intake ports already ouflowed the head intake ports i decided having it professionally ported by a company like azsm would be a waste of money so i port matched it myself. I milled the intake runners down so that they matched the floor of the plenum(in stock form they jut above the floor more than 3/4's of a inch). While i was milling it i also cut 1 inch out of the runner divders because every one else always does so it must be good . Next i blended the edges of the runner tops and the center dividers so they wouldn't disrupt flow and would have a good transition when the air entered runners.