Maybe you guys can help me with my frustrating engine problem on my caddy. It's a 1970 Coupe with a 472 ci. V-8 and has about 115,000 miles on it. The engine has been freshened up quite a bit since I got it including a top end re-build, full tune up, new exhaust system, etc. Recently I noticed that the engine has begun stuttering. It still starts perfectly, but seems to have this skip and shakes throughout the throttle range like it has dropped a cylinder. It does it in neutral and while under a load, it never goes away. I did a compression test, it has ample in all cylinders. I put in a new set of lifters thinking maybe it had a collapsed lifter, but that didn't change the problem at all. I checked the cap and rotor, and wires (all fairly new) and it has ample fire throughout. I replaced the plugs, which were black with carbon, but it had no effect on the problem at all. What am I missing here? When I changed the lifters none of them looked overly cupped or deformed on the bottoms so I really don't believe it's the cam. Could it possibly be a rocker or pushrod? The tips of the rockers where they contact the valve stems did look well worn. The pushrods looked straight from what I could see. I looked all over and didn't find any sort of vacuum leak or anything around the crb or intake. I'm at a loss. Any suggestions would be really, really appreciated at this point. THANKS!!