Recently I bought a '69 J-3500. It has a '69 430 with a newer Edelbrock 1406 carb and stock ignition. It was running but not well. Over the last couple weekends I was able to do a simple tune up. Replacing the rotor, cap, points, condenser, wires and plugs. After everything was replaced things did run a lot better. Idle was now holding and things seemed to be doing better. The old plugs looked wet, like it was far too rich. I next leaned the mixture to something more believable. Using the Edelbrock lean idle instructions. Again things were running little better. I next moved on to the timing and advance. It was set to zero TDC at idle. It is now set to 10 deg. at idle with a 30 deg. of advance at 2500 rpm. So far every step has helped, but things are still not right... not even close to right. I've noticed a bit of a vibration/shake when coming off idle. It feels more like an out of balance on the engine. If I'm just running in the garage it isn't bad, but under power while driving this shimmy is insane. When I put it into gear the engine will drop a good 300 rpm. Then when I try to move the power just isn't there. There is a really big vibration/shimmy that starts to get bad about 1500 rpm and stays until about 2000-2500 rpm. Going up a hill there is nothing there. It can barely keep up 30 mph. If I floor the throttle there is little response which will eventually get going. Though nothing like it should. I should add there is no knocking or smoking. No water in the oil or oil in the water. It doesn't smell overly rich anymore. There are no leaks. Other than looking old and dirty there is no outside indications that this would be a bad motor. Though everything I feel when driving says the engine is toast. Anyone have any ideas's as to what to check next or if I missed something? I know I need to do a compression test. Other than that, what else can I look at before throwing in the towel and saying this engine needs a full overhaul?