It kinda sounds like you have the Z24 4 cyl standard 80's motor. You should count eight spark plugs, 4 on the intake side, and 4 on the exhaust. Eveything else you mention should be accurate for the Z24 but it would not be a 6 cyl. However, you state that the truck is a 93. The last year for the Z24 was 89 or 90. A 93 should have the KA24E (12 valve 4 spark plug) motor.
Post a pic or email one to
aford@ma.rr.com and I will take a look at it or post it accordingly.