Well, cylinder studs were slightly long by about 2 threads so Dempsey's measurement of 5.315 inches is from the cast surface of the crankcase and not from the machined cylinder mounting face. I tried the original socket head nuts and washers and got ample engagement of the Allen driver to torque nuts to the proper value as recommended in the Bentley manual (torque to 11 ft-lbf then rotate through 90 degrees).
All is progressing well at this point. The cylinder heads from Anchor Atlantic were things of beauty. Bob Hirst did a first-class job on reconditioning and I'm very pleased with the quality, price, and rapid turn-around.
With heads installed, cam housings were next:
964 camshafts are being installed in this 3.2, so the RH cam had to have the power steering drive stub cut off:
With both cams installed, timing was set using .490 intake lift @ TDC, corresponding to the 4 degrees BTDC inlet opening point.
Hope to have it all back together in the next few days.