Stud those heads with ARP studs. Stock headbolts are all Torque-To-Yeild stretch bolts. TTY, those bolts can be used one time, and you stretch them to get the torque you need. They suck. ARP headstud that thing, and it's a much better engine, after that. With the engine already together, you can do them one at a time, to factory torque, replace them one at a time, all factory torque, then torque them all down to the ARP recommended torque (which is much higher). Don't even need to replace the head gaskets that way. Tell him to get those poop SHIIT factory headbolts out of there. Step one for bulletproofing that engine.