believe me i know about unforseen cost,just was pointing out some things i have had experience with.
question,on your head at the head bolt contact area,was there any indication that the aluminum had deformed where the bolt or washer is?
i have seen some that had been so hot that the aluminum had softened. a study of aluminum heat treating verified that the metal will soften if heated above 320deg f and left to cool to ambient slow. a local shop put one of those soft heads back on after the machine shop did the rebuild with bad results,after 3 times they got another head that showed no deformation at the head bolt contact surface and job was a suscess. best i can figure is the metal should test in high 80 on rockwell b scale.
larry perkins