I inquired if the new pistons would have offset pins like the originals. He said if you want it they will build it. After lots of research on the subject I have determined it is mostly for cold noise reduction and any performance difference one way or the other is negligible for a stockish engine. So I am inclined to go offset as it may negate some of the forged piston noise.
Edit: after some thought the amount of offset seems to vary among different combinations and I cannot seem to find out what dictates a specific amount of offset. So the offset in the originals may not be correct for the customs unless offset is a function of stroke and rod length. I have a 4.5 and a 5.6 piston. Tomorrow I will try to see if I can measure it.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT