Cranking?

My original post had gotten to the point that I just felt better starting all over. So here goes the history hopefully we can get it fixed. I have a 1991 Chevrolet 1500 Silverado package 6 cylinder 4.3 motor that originally back in April quit running I was driving it and it just cut off I didn't lose power the motor just cut off I Coasted off the road set for a couple of minutes and the truck crunk right back up. I went about 30 yards and it died again and I haven't been able to get it to crank or run again. I have replaced the battery, checked the grounds, fuel filter, the map sensor, 3 sets of plugs, plug wires, air filter, distributor, the whole timing chain kit, I have took off and cleaned the EGR valve, I tested the fuel pump it's good and checked all fuses in other words I've been to the mountains and back with his truck and still nothing. I've set the timing manually and yes I made sure that it was on what the factory says it should be which is 0° and it was at top dead center with the rotor on the distributor pointing at spark plug number one. I have since went and got a compression tester a fuel compression tester and a timing light and a tool to see if each spark plug is getting fire or not. By myself as stated and I've used you guys many times and never have y'all let me down I'm not saying y'all let me down now I'm just frustrated. As of right now I have took out the EGR valve. The only thing I can think of is I was told to use the first line on the crankshaft pulley when setting the timing but yet I've seen different answers on the web and also in the manual I have but I also started several mistakes in the manual. So I guess that's my first question which line on the crankshaft pulley do I use to set the motor at top dead center the first or second? The second question is does EGR valve need replacement the one I have on it it's original and when I press the button on the back it does move but when I apply vacuum nothing happens? It's my fault if that's the problem because y'all told me early on to check the EGR valve but I didn't run a vacuum test on it I just cleaned it and I figured when I push the button in the it moved it was all right. Going to go ahead and replace it and in case it don't work is there anything else I can do? The only good thing about it is that if it does crank finally it'll be a while before I have to work on it because of all the new parts. I just want to say it's hard to find information because for some reason 1991 Chevrolet Silverado the diagrams I find online and the forums I find online don't match up with the motor as far as where things are. So basically I'm saying with the Chilton manual having mistakes in it y'all are pretty much all I got. Big thing seems to be the timing and I understand that setting it manually is not ideal but I can't set it with the gun if it isn't running and I'm assure you that I set it word for word how I was told unplug the wire turn the crankshaft I made sure the rotor was pointing at number one spark plug and I made sure I was getting smart and the number one spark plug was top on a rotation and up stroke. Send a short video of the EGR valve like I said when I press the button you see it moving but when I put vacuum on it it doesn't move I don't know if I'm not using enough vacuum or not. I'll be waiting to hear back from you