check your gauges. fresh motor is 150 psi unless you went to 12:1 and built a race motor. then it shouldnt be in a boat
check your battery. bad battery or bad connection would not turn over with plugs in.
Why?
Mechanical pump is superior to electric pump and half the cost
A set of points will last you decades with a bit of maintenance. The pertronix conversions have had issues
Pull the drive, salt water will be in the bellows
Get the motor running
Pull starter and alternator and pull them apart, clean them, oil them and you may be able to save them