The Best Crank is Stock Crank.

Here's Honda's updated crank part # 13090-hp1-315.

They did not use a crank sensor in 1984, There was no need for 1

The crank sensor is located behind the hamonic balancer

Next to the crank pulley. Held on with 2 10mm bolts.

the crank position sensor sends info to the ecu for position of the crankshaft in order to fire the correct amount of fuel and when to send the spark to the sparking pulg.the engine will not start.you can find the sensor mid engine near the crank.