I finally decided to set the initial timing by using the vacuum guage today. I got it to the highest vacuum number and then retarded it just a bit. Doing it this way completely fixed the issues I was having, as well as gave it a TON more power. The truck is about twice as fast as it used to be, night and day difference. I believe the explanation to the problem is not my timing light, but rather the harmonic balancer. The crate engine i bought was supposed to be an 80's engine, but i bought a harmonic valacer for a 75 truck because thats what year the truck is. I didn't realize they were different until now. Now I need to figure out how many degrees off the older harmonic balancers are from the new ones. Or just buy the right one.
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