No Top End Power, 1.8 L-Jet Options

[motorvated]

I'm not expecting much from a 1.8 but seems like it is lacking power under load at higher rpm. Top speed is about 80 mph, and not enough power to get it into 5th gear. Engine is tuned, distributor is cleaned, timed and has full advance, point gap is to spec, valves adjusted, new air cleaner, fuel filter, plugs, points, condenser, coil, wires, cap, and fuel pump. New fuel cell, so no tank sock issues. Throttle is opening all the way, and fuel pressure is to spec under load. Injectors cleaned with good spray pattern, cold start valve not leaking. New vacuum lines. EGR, decel valve, and crankcase breather all still hooked up to intake snorkel. Tried two different AFM's, and although one seems a little stronger, it's still weak at the top end. Even went through the AFM static and dynamic mixture adjustment procedure on one of them to set it at " just lean". Richening it doesn't help. The only thing I haven't yet checked is compression, but engine idles smoothly, burns no significant oil, and pulls cleanly to about 4,500 rpm. Don't yet have an AFR to confirm mixture, but planning on getting one soon.

Running out of ideas, anyone have any suggestions? Should I disconnect the EGR, decel, and route the crankcase breather to a catch bottle to rule these things out as potential contributors to the problem? Obviously, I need to do a compression check. I'm running the cat at elevations ranging from 4,500-7,500 feet above sea level, so that will have so effect on performance, but I expect more than I'm currently getting.