Well it's nice to see someone else working a 350 Poncho!
I love the power and throttle response of mine. When I built the engine, the Comp."xe" cams were not yet available, so I have one of their older style "HE" cams at 260 advertised duration. Comp lifters, valve springs, and 1.5 ratio roller tip rockers. I believe I used their chrome moly pushrods too. My heads are stock "average" castings, but have been ported/polished and I had a 3 angle valve job done, that was radiused to remove the sharp edges. They're the smaller valves but that's all you need with the 350 CI displacement. The intake is a stock 4 barrel (out of a 74 catalina I think). It's been port matched to the heads. Carb is a 600 cfm Edlebrock (sp?). Exhaust is Hooker Comps (small tube) with the Flowmaster "Force II" system. (single muffler sits behind the tank in the stock location..no clearance issues..). Ignition is a new,stock point type (Engine is 1970 vintage...heads...1972) It's converted to the Mallory unilite trigger, Malllory Voltmaster coil, and Hyfire IV spark box.
Now I have no idea how many ponies or how much torque this combo is giving me...but I like it! It's way faster and smoother than the stock 403 olds that came with the car.
A word of caution...It's real easy to go overboard with cam and carb choice. "back in the day" when I first built it...information was limited (no internet) and I put a crane "fireball" 292 adv. duration cam in it...great came if you want to drive between 60 and 100 all the time ; P ! I guess try to remember ...it's a small cubed engine..
Rick C.