Don't recall if Arp headbolts require a retorque or not, but standard ones do, recommended after 5 or 6 thorough heatsoaks of the engine. Probably wouldn't hurt to check your Arp's anyway, just to make sure they were all torqued evenly the first time around. Also, make sure you only do one bolt at a time and in the proper order, and only crack it loose a little before re-torqueing it. You don't want to risk the HG shifting even a miniscule amount.
If I had caught your thread earlier I would have recommended replacing the heater union bolt and hoses on the back of the engine. The bolt tends to corrode and leak after a few decades, and the hose back there ages poorly as well. With the head off they aren't too bad to replace, but a cast iron bitch with everything in place.
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