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As far as the studs go, remember these are 40 year old (plus) studs. They should all be replaced as a matter of course. Now should you buy the "ARP" studs ? That I feel is a personal decision as to what you want your truck to be able to do. If your going to try and "up" the injection pump for...

Here. http://www.steelsoldiers.com/showthread.php?132535-Old-style-head-gaskets/page3 Surprised you forgot this as you posted there after I posted my findings.

Totally agree ! Time to spend the money and get those really good "ARP" head studs.

You have either 1) bad head gaskets or, 2) a cracked head. Either way the heads need to come off.