It seems at one time in its life too long of a bolt was threaded in the rear waterneck attachment. when you remove the thermostat there appears to be evidence of a repair there.
Now I have a leak coming through the bolt hole. One thought is to replace the bolt with a stud using something like JB weld. Then just slide the waterneck up and down the stud when replacing gaskets or thermostats.
Any repair comments would be appreciated. Its an Edelbrock performer manifold on a 454.