The assembly on top of the starter is a simple high current switch. Stomping the floor button moves the lever on the starter which does 2 jobs. It physically engages the starter motor to the flywheel and pushes the button on the switch to provide current from the battery to the starter motor.
The first thing you need to fix is "The starter button is sticking down when I push it". There is supposed to be a return spring on the linkage just above the starter/bellhousing interface. If it is not there, get a replacement. If it is there, take the ground cable off the battery and work with the linkage until it returns on its own. A little lube (real Lube, not some spray designed for "water displacement") might do wonders. Could be that the linkage is rubbing where it goes through the cab floor.
Once you get the mechanical part working correctly put the battery cable back on, try to start again and post results.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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