A friend has a 1971 Country Squire wagon with a 390 and he's getting a miss. It had been sitting for 10+ years we're begining to suspect it may've been parked because of this miss. It's not a hard miss but it is noticeable at idle and in higher RPM. Everything's stock. All the basics have been done. Compression check is good, carbm was rebuilt (and rechecked 3 times), all ignition components have been replaced (cap, rotor, plugs, wires, condenser, coil, swapped out a distributor). Timing, and dwell has been set. Also replaced the fuel pump, it's running off a small gas tank from under the hood. Measured the cam lift at the rocker arms. We did a cylinder balance test and couldn't pin it down to any cylinder. And that's where it sits today, any more ideas?