[TonyMadrid]

Try the simple stuff first.

I'd check the ignition timing first. Bring #1 piston to TDC and check to be sure that the distributor rotor is pointing to the #1 terminal of the distributor cap. Then follow the firing order to be sure that the firing sequence is in the correct order. Be sure to note the direction of rotation of the rotor so you don't set the sequence in reverse order. Once doen, be sure that you have the correct wires going to the correct plugs.

If that is not the problem then perform a compression test to be certain that you have good and consistent compression. If you find low or no compression in some of the cylinders you may be out of valve timing which may have been caused by a timing chain that may have jumped a tooth. Or it could be a sticking or incorrectly adjusted valve. Hopefully, it's not more serious internal trouble.

If the valve timing is off then you have to pull the front cover and re-align the cam and crank gears. If you go that route, replace the timing chain and cam sprocket.

Remember it is important that you set both the valve timing and ignition timing correctly so the turning system will be correctly in phase with the ignition firing system.

Remember the rule of thumb for what is needed to get engines running:

1. Cranking
2. Compression
3. Fuel
4. Ignition

If any of the above are not there or are there but at the wrong times the engine will not run or may run but backfire through intake or exhaust.

Good Luck,

Tony