I noticed this morning that the engine RPMs change when pushing the brake pedal, so I think the booster might still be functioning... I'm going to replace the brake drums first, then the brake hoses, and then if there isn't enough improvement I'll either replace or rebuild the master cylinder, and finally, if necessary, the brake booster.

The temp sensor is brand new, so it could be the gauge... I've got a long list of things that I need to do, but I'm much more motivated to work on it now that it's running and driving.

After I get the brakes working better I still have to replace the oil pan gasket, clean the engine bay, change the gear oil in the axles, change the engine oil... Lots of little stuff.