Taff,
What are you comparing the rig to when you say it is stifled. Usually if the engine starts, runs well and doesn't burn oil and smoke, it's a clean bill of health!
This would mean it's a tuning issue. Timing is very critical for the proper get up and go! The carburetor has a power valve in it that gives the engine a shot of caffeine when you put your foot in it.
If it isn't some mechanical issue, such as dragging brakes, then it must be in the power production end of the equation.
You haven't indicated what kind of rig you have. Is it a standard transmission or automatic? One of the first steps would be to take a compression reading so you can get a handle on what you are dealing with.
I would verify the timing again. Vacuum is critical...no leaks are allowed. The vacuum advance on the distributor must function and the gasket under the carburetor must be positioned to allow the carburetor to sense manifold vacuum.
Take a look at your exhaust system too! Maybe someone put a potatoe in your pipe.
To get net, if the engine is in good condition, then you have a tuning issue. If the engine isn't in good condition then that's the problem.
Stuart
