It has the Delco EST ignition. So I believe it's electronic. It won't even start not. It has strong spark at the plugs. Replaced the fuel filter. Good fuel to the carb. I'm worried it's the cam sprocket.
I tend to agree here...sounds like a timing issue.
This motor uses timing gears that mesh together, NO timing chain. so unless you jumped or lost a tooth on the gear that should be ok but anything is possible.
A couple of questions first need to be answered.
Also the manual shows three ignitions, point, est, digital/distributorless.
1. does the rotor spin when cranking the motor over? If not the distributor gear roll pin has sheared and the dist needs to be removed.
2. in order to determine if the timing has changed (for some reason) you need to find TDC on the harmonic balancer (number 1 cyclinder must be on compression stroke) and confirm that the rotor if you have one is pointing at or very very close to number 1 spark plug wire location on cap.(need to know exactly what ignition, EST {cap and rotor} or Distributless {no large cap or rotor) system.
when you say dist wont move, do you mean you can not turn it? There is a screw and clamp that are used for this purpose (hold down on shaft base flange) and this is how base timing is achieved.
If all of the above is normal there may be a chance your ignition module failed as it controls timing........
that fact that you have spark says the coil and distributor internal parts function, correctly is not known yet. there are some tests for the internal parts.
typically if the internals go then spark is lost.
Also take the dist cap off and look at the internal parts and see if there is anything obvious that may not loook right.
Additional troubleshooting is in order
