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It is mounted inside of the distributor under the rotor button.
Yes.
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YES, The 350 Vortec does. It is in the back top side of the engine. All the plug wires go to it.
The distributor cap and rotor are located on top of the engine in back. Points haven't been used for 35 years, it's all electronic now.
Top side rear of the engine block next to the distributor.
It's at the top rear of the engine near the distributor.
The 4.3L V6 GM engine does not have a timing belt it has a chain, and it does not directly drive the distributor.
Yes you just have to put on your intake manifold off the newer engine, change over all of your sensors and put in the distributor off of the newer engine.
The egr valve on the 1999 vortec v6 is bolted to the intake valve. It is just behind the distributor.
On top of engine, in back, just to the drivers side of the distributor.
Top rear of engine, next to the distributor, drivers side.