What to do

[Domingo]

Last night was adjusting the valves and guess what #2 exhaust valve does not open as much like the rest. Flat lobe. Engine is a sbc 350 I replaced rings bearings gaskets I did a budget rebuild. To do it right I got to pull the engine out and do a complete tear down and cleaning. I also have a little 307 that came in the truck for some reason I want to build it the only drawback on the 307 it has a piston ridge which will need new over size piston more $$$. what should I do 307 or the 350. I would like a efficient v8 maybe 300hp. Both would get a set off heads from jegs or summit