B. Is there a block inside the boom ? I am unable to see inside the boom since the sheaves are riveted to the end and so are clutches at other end of boom.
If you need access to the block inside the boom (if indeed there is one), you will probably have to remove the casting that forms the end of the boom and which contains your outhaul and reefing sheaves. On boats I've looked at this casting is held in place by a couple of screws.
If there is no block you may want to install one -- the mechanical advantage makes it a lot easier to tighten the foot of the sail while closehauled.