[rotorwrench]

Intake valves don't stick as often as the exhausts do. Compression check will tell which ones are sticking if that's the problem.

Backfire by definition is when the engine coughs back through the intake of the carburetor. It is caused by a very lean condition. Fuel delivery should be checked for proper fuel movement and pump pressure with a low PSI reading gauge. If delivery is good then something is blocking ports or jets in the carburetor. If it idles good then it's not the idle circuit. The accelerator pump function should be checked. If idle is good and accelerator pump function is good then it's time to open up the carb and clean it all out.

Vacuum leaks can be from a loose manifold or carb base gasket. A damaged intake manifold on rare occasions. Any rubber hose to a wiper motor may be bad. The throttle shafts can wear out and leak. Automatic choke systems can leak if so equipped. A bad vacuum advance servo can also leak which will affect vacuum and distributor timing and especially on an 8BA engine.

Door glasses are removed from the bottom through the open port there. The division bar has to be loosened on top and unbolted at the bottom to push it forward enough to slide the glass down and out. The longer it has been together, the harder it is to do this job. I'd suggest replacing the vent rubber and any worn out glass track components while it is apart if possible.

Glass setting tape will be needed to install a new glass in the support channel.