Yes, if you have one it will be on the front of the valve cover. On mine when it is horizontal, pointing to port, that is the running position, vertically one exhaust valve is working and at 110 deg no compression from memory. Its easy enough to see by turning the engine over and seeing if you have compression or not. I doubt if without a decompression lever you will be able to get it to start but a very low geared extremely powerful drill just might if you can hold it. Good luck!
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Yes. At the front of the engine, just above the raw water pump at about 1 o'clock. Lift (if its been installed correctly) the decompressor lever on the top of the engine and it should swing over.