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85 Chevy c10 4.3 liter v6 timing has to be advanced all the way to the firewal

(1990 Chevrolet 1500 Pickup)
in Las Cruces, NM on March 14, 2017
I have replaced the timing chain also a complete distributor,cap rotor,plugs and wires I have to advance the timing all the way to the firewall to get it to start I have spent $600 just on parts I am really confused and no one can give me an answer I have never had this much problem with getting a vehicle running. I am just about ready to put a 350 engine from my 76 Monte Carlo because I don't want to have to replace the cam . The timing is on top dead center the rotor is pointing to the #1 tower
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on March 14, 2017
You either have the distributor set in the wrong position or the firing order is off!! .. Pull the # 1 cylinder spark plug out (front cylinder on drivers side) .. Put finger over plug hole .. Have a helper bump the starter until you feel compression .. NOW look at the piston through plug hole and bring it to top dead center (crank balancer mark may be off due to outer ring slippage) .. NOW check distributor rotor position... Re-check plug wire firing order .. This engine IS the exact same thing as a 350 with two cylinders omitted!
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on March 14, 2017
Pushrod probably already nailed it, and likely you already know, but the distributor will turn when inserted, and there has to be counter-rotation of the right amount prior to inserting the distributor shaft, or the distributor will rotate too far.
The funny thing is, you can set the distributor in any way you want, and rotate it until timing is correct as long as the firing order is correct. If it is pointing to #1, make sure the plug wire for number one is correct.
Lastly, if you need that much advance to run, your distributor also may have a sticking mechanical advance, or a leaking vacuum advance canister.
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