Not starting

5.7 350 is the same motor in 89-94 GM trucks.

Distributor and parts should be the same.

From the coil wires, follow the harness around the back of the engine and see if you have a broken wire, fusible link, burn mark, etc.

I took everything apart again. Reassembled the distributor checked the reset box and wires going to and from the new coil, looked under the dash, checked all wires there and the main harness going to the computer. Tightened the wires for the oil and water temp sensor....................splashed a little gas in the carb................
and it fired right up. Idled for 5 minutes, shut it down and she started right up again.

I have no idea what happened. I'm happy with a new coil and I may get an electronic distributor, anyway. It runs like it's injected with the Marine Avenger carb. I rarely have to even prime it. One turn of the key and she sparks to life.
I must say I'm a bit concerned it may happen again. Hopefully it was the coil and I didn't have it set up quite right first time around. I have yet to find an inline fuse from the engine. There are a few under the dash going to accessories but that is all I see.

Thanks for all your help.
I'll keep you posted!

Sometimes the ole "wire jiggle" procedure fixes things!

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Did not start today. No spark. Did everything I did yesterday, no luck. Battery connection is strong, new battery last year. I guess next step is testing to see where the power ends. I am out of ideas at this point.

It sounds like you have a loose connection, or some corrosion on a connector, or a wire broken down inside the insulation somewhere. Didn't you mention that some of your gauges go in and out sometimes?

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Yes, most of my gauges stopped working years ago. Tach works most of the time but can be halfway around the dial when it fluctuates up and down. As I said computer works, bilge, running lights also. I will get a buddy to come over and help me test individual wires. We did a small test today and there was power to the new coil but no spark. took a plug out grounded it and connected it to the coil directly. No spark. Can't get to it until Monday. Away this weekend. Boat is in the hoist waiting.

Thanks

You have an ignition wire broken or loose and/or a bad ground.

A test light might need to be used over a meter.

Ignition switch itself could be corroded inside on the contacts, too.

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Thanks will check that When I get back to the lake.

Jumper the fuel pump and you should hear it running.