I should think that you may have to be guided by emissions testing.
The 62/63 cams have an extremely short intake profile (163deg. @ 2mm lift).
The 08/09 cams have a profile more in line with the rest of the US spec cams (179deg. @ 2mm), and would be my choice.
The 26/27 cams are unfamiliar; are they from a late 560? 1986/87 560s were fitted with 18/19 cams (187deg. @ 2mm), but with a late intake lobe center (120deg. ATDC) to reduce overlap and unburned HCs.

Frank-

Yes- they were from a late 560SE:

http://www.startekinfo.com/StarTek/outside/11883/PROGRAM/Engine/107/M116_38/05-220.pdf

They are really nice looking whereas the others are so-so.

If I go with something non-380, I would assume I would need to adjust ignition timing?

There is no emissions testing where I am ( and never will be).

What might be the benefits/detriments of the 420 (or 560) cams

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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)

From the info page you provided, it would appear that the intake timing is the same for the 18/19 and for the 26/27 cams.

The duration of those cams, combined with the late intake timing, may simply be too much for the smaller displacement 3.8L. Both fuel consumption and performance are likely to take a hit.

The 08/09 cams are much closer to what was used in the 3.8L in the rest of the world (ROTW), but would benefit from being advanced by 6deg. (crankshaft). When advanced, the 08/09 set would match the 70/71 set.

Ignition timing, as always, benefits from being adjusted to local conditions and fuel choice.

So are you saying set the crank at 6 deg BTDC and the cams (theoretically) at zero? Would I need to do this with offset woodruff keys on the cams?

Thanks very much for your advice, Frank...

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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)

Yes, and yes.

Wait a second, see how little I know...

If crank is at 6 BTDC and cams are at zero and I have woodruff keys then I am 12 degrees...

If I am using woodruff keys then start with crank and cams all at zero and add the keys ..that would get them to six (except that all I can find are 5s- close enough?). A tooth on each cam is too much?

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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)

Keys are available in 4 offsets:

0.7mm [621 991 04 67] 4deg. crank
0.9mm [621 991 02 67] 6.5 deg.
1.1mm [621 991 01 67] 8deg.
1.3mm [621 991 00 67] 10deg.

Choose 6.5deg; chain and sprocket wear will negate the 1/2 deg. difference.