Have you inspected the plugs? If you have one that is really 'clean' compared to the others then you probably have a head gasket leak and water is getting into that cylinder and exhaust gas is getting into the coolant. Had this happen on the Bird recently and had a hard time tracking it down because none of the classic symptoms of a head gasket leak were evident. May not be the issue but really easy to check out.
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69 Bird w/1970 400 block(409 cubes), #64 heads, hyd. roller, Q-jet by Jeff E., original interior, ps, pdb, th350, and 3.73 gears. Pump gas, street driven muscle. 3800 lbs. race weight. Best, 11.39 @118, my son's car.
79 T/A w/463, Scat crank, Eagle rods, Icon pistons, Lunati solid roller, 262/270, KRE 325 heads, Northwind intake, QF950 carb, full interior, ps, pdb, th350, and 3.73 gears. Pump gas, 3650 lbs. race weight. 10.60 @ 126 so far...
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