OK...I've lurked a bit so now I'm asking.. Had my K5 about 5 months....a work in progress...84 model, 305V8, Auto, NP208, stock axles. Just can't seem to get it running well. Hate to put it in the shop. Here is what I've done: full Tune Up ( plugs, wires, cap, rotor, ingition module), fresh rebuilt carb, thermostat, magnaflow cat, heater hoses, many vacum lines replaced. Just doesn't want to "run right". Sounds like crap (could be the crappy muffler po installed). Very rough idle. Timing looks about right. Damn I hate where the timing marks are ( can these be moved down with a Jegs or Summit SBC timing mark add on?). Suggestions. Thanks in advance.