The biggest issue with your compression test is not having compression of 155 and not 180. It is the fact that the cylinders have a 15psi difference in compression. If you do a wet test on Cyl 4 it will show solid. It's the rings.
Your options are to
A) Boost this engine. I may last, it may not. You may spend a ton of money just to destroy an already weak engine.
B) Find a low mileage (compression AND leakdown tested engine) BP. Think reputable JDM engine importers.
C) Build your engine. Obviously, most expensive (although option A may be the most expensive in the long run. Blow the engine, have to use B or C anyways.).
I think you ought to do the reading on the 1.6 and 1.8 yourself. There's plenty of material on the forum. Limiting factor of torque is the rods, and they share the same rods.
If you are on a steep budget, mkturbo.net
and classifieds for intercooler/engine management.
There's a Megasquirt 3
in the classifieds now. May be a good time to jump on it if you are serious about your project.