The 1964 Corvette is a bitsa ,the base is wrong for the engine ,as the side port should be on the opposite side for later 1964 Corvette mowers like this. When the port is on the other side it's used for edging and is not a side discharge port.
The engine is missing it's front mount air cleaner and obviously the starter should be the impulse starter , I'm not a fan of the impulse starters ,I have early mowers that run this starter and they work fine without a decompressor.
The impulse starters were only designed to work for a few years but a recoil starter will outlast the engine.