[Elbert]

oil pressur switch is down near the distributor....kind of long looking sensor, it screws into the rear of the lifter valley....just to the rear of the intake manifold. You'll see it fairly close to the distributor. Timing going to be hard to check without engine running....unless you want to take some stuff apart which I doubt. Remove power wire from distirbutor....remove #1 plug, place thumb over spark plug hole....., bump starter...turn engine over until you feel compression out of the # 1 plug hole....your timing mark at the crankshaft balancer should be close to the 0 degree mark (base timing). I doubt this is your problem. LIke I said before...it the truck spins over fast..when you try to start it....then you could have jumped time or had teeth missing off the timing gear...or mayb have a broken timing chain (these rarely fail). I think if you had a timing problem you would have a lot of popping back through the throttle body or backfiring.

DO you have any idea what year that 350 is and what vehicle its from. I can look up some stuff for you. I have a shop manual for a 92 K1500. CHilton makes a manual on cd-rom that might be avalaible in your local book store. Its not great but its better than nothing.... probally paper copy too.