340 cam help

Good point on getting a flow test done.
This is the article I based my home porting on; nothing radical here. The heads I started with were fairly smooth as cast from the factory. I also cleaned up and highly polished the exhaust ports. http://www.moparmusclemagazine.com/...orting/intake_port_modification_sequence.html
I've run this engine combo on the street with a Comp XE262 4 speed OD 3.91 gear and the combo pulls hard from 1500 to 5500. Cruise at 2300 75 mph and 18 mpg, great torque and throttle response.
My initial thoughts for a cam change to more strip time was something around 230 @ .050 .480 lift. A little more lift and duration to get the trap speed up and use an automatic for consistency.