283 I assume, or V8 anyway - if you have an air lock it'll be right under the thermostat, no water contact on the sensor in it means no matter how high anything gets, the thermostat won't open to let the air out
pop it out and drill a small hole in the plate beside the opening, fix'er right up - helps to pre-charge the manifold so water is right up to the thermostat opening before you put it in too
Bill
