318 horsepower

I'll add to what moper has stated, that the exh will flow 185-190 without porting, but doing a 75* cut and a good valve job should give you more than the 318 will ever need. Also I strongly agree with the stock size valves on the intake side, do a back cut and a good valve job and trim the guide a bunch, gasket match the intake side to the 360 port window and you'll be in the 225-230 range on cfm's. This is what I did and the car has done a best of 7.303 @ 98 mph 1/8 with a 1.53 60 ft time. Also this was useing a 280 hyd. comp cams cam and a stock short block with all the good machining done.