Its times like these I wish you were still in Lannie... Yes we are still on the farm, sis should be home at that time from what I've heard - she's currently ripping it up in canada! Been there for almost 9 months now.
AFAIK you don't need to be shorten any prop shafts or drive shafts. If your gearbox is a 23 spline output shaft unit your MY shafts will slot straight on. Just make sure the diff is the same as the rear, I'm 99% sure your rear diff will be 3.7:1 ratio. If the gearbox is the same you'll be sweet - I'm also 99% sure that the gearboxes from the post '87 L's are all 3.7:1 ratio as well. There will be a sticker on the back of your rear diff that will tell you the ratio, unless you have L.S.D. on it, if that happens to be the case I'd hang on to that one and NOT let it go!
With the flywheel you can get your current one machined to fit the L series clutch plate and clutch pressure plate. A machine shop should be able to help you out with this one. Dunno what the cost would be though.
Don't worry about taking the gearbox apart. If this is really too much I'd suggest getting a replacement gearbox until you have a little more mechanical experience and knowledge (and funds) to take this on. I know the feeling of working with a budget, that's how I've build up Ruby Scoo, always on a budget! What you need to do is decide what you want to do with your subi, do your research on how to do it then start collecting the RIGHT parts you need - also make sure they're at a good price. A lot of this comes down to being in the right place at the right time! You can't plan that...
As for the weber I reckon you'd be right with that - an adaptor plate, weber, choke cable, bolt it all together and you're sorted. If it doesn't work reverse what you've done and replace it with what was there before hand

Its all learning, just so long as what you've done is reversible, you may loose a day doing it but in the end you've learnt something - hopefully!
Again, I'd grab a second hand gearbox and swap before shelling out the tough stuff for a reconditioning of the old box...
All the best, I'll keep an eye on how/what you're up to

Cheers
Bennie
PS sorry for the late reply, been on ski camp all week
