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I rebuilt my 2.7 about 5 years ago and I'll give you my advice. I can understand wanting to save the money on rod bolts and bearings, but if you can afford it I'd replace them. The case needs to be checked by a good shop for alignment of the bearing saddles. There are studs that need to be timecerted including the one that is at the intermediate shaft bearing. You won't believe how easy it is to pull the case studs out when you put the engine back together. For some reason the threads pull much easier than aluminum threads. A good shop will know which ones to timecert. Be careful when you tighten the dome nuts on the rear studs that go around the number 1 main bearing. They will also pull. I tried using the larger o-ring on the number 8 bearing to get a better seal and the caused problems. The seal pinched in between the case halves and I pulled the studs around it trying to get the case seam to close. (so I recommend using the correct o-ring).
-Andy
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72 Carrera RS replica, Spec 911 racer
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