I have a Series 2a Lightweight with 3.54 diffs, V8, LT95 gearbox with the short101 bellhousing. I am still on original fronthalf shafts with UJs. what route do I take to fit constant velocity joints? - Would 109 v8 half shafts fit? I can't find a description of whats involved.

I was under the impression that you had to fit the entire Stage 1 V8 axle to gain CV joints but I could be wrong.

A different option would be to fit some coiler axles. Like those on a Disco 1. You’d have to modify for a spring perch for the leaf springs and they are wider, so depending on tyre/wheel choice may need some 90 style wheel spats.

Thanks wireman - :-Having read a bit further I think the cv halfshafts are too big to fit in the series axle casing - so even though splines and driveplates look interchangable (maybe?) it's an entire axle change as you suggest.
I think I shall check my handling with the front prop off and the diff lock in - that accurately emulates series on road rear wheel drive with similar unloaded rotating components in the front axle. I'll see if the weight of the centre diff interferes with gearshifts. If that's OK I will try free wheeling hubs instead of removing front prop - see if all is sweet with both or possibly just one released to release windup, and the diff lock on. If that checks out then I can off road as normal series four wheel drive with all engaged and emulate normal rear wheel drive for road work. - added advantage would be the option to use the centre diff for hard road sections when offroading. Possibly the biggest advantage would be replacement parts would not be the astronomic price of the CV alternative.
Anyone else explored this approach? - It's sort of like Ashcrofts LT230 part-time FWD kit mod with FWHs

Not a good idea to drive the front halfshafts without freewheel hubs engaged , the hubs tend not to like the shaft running when not engaged.

Well - there would be negligible speed difference at the hub when disengaged as the diff lock would be in and driving the front axle (instead of the other way round in a standard series vehicle in two wheel drive) only the wind-up creating small speed differences - no parts would be under any load - I can't see that the FWHs would be stressed in any way - do you mean that the UJs and halfshafts do not like being driven unloaded?