1988 Roller Cam 318 'entry-level' power potential?

Hey MOPE, I used to live in Wellington :D
One thing about your area, you are dealing with a lack of air, and your motors are feeling it. The engine doesn't increase red blood cells to accommodate... LOL, so whatever you can do to throw more air into the throat, the more that Fifth Ave will like it :) The 302 heads are perfect for a 318 of your type of build in Ft. Collins, and they'd be better if there were some home-porting. I personally don't know if I'd change the cam. You can increase top end power through the carb, intake, heads, and exhaust. that cam might be the ticket for maintaining low end torque