a few questions

[BradMph]

Did you get a clutch line up tool with your clutch?
clutchTool.jpg

If not and you just installed the clutch plate without the tool then your spline gears are not meshing. Another problem could be the pilot bearing on the end of the spline shaft. This bearing should be fitted to check for correct size. If by chance the pilot bearing is installed wrong it will make noise and fail in a short time.
One way to bring the trany and block together is not recommended as written in the manual, but sometimes it needs to be done to pull them together. Once you get the 2 parts close enough to get the guide bolts in. (Two bolt holes that have the sleeves installed). Install the 2 bolts into their respected holes and draw them together evenly from under the vehicle is usually best. Sometimes the 2 parts are a tight fit and having the bolts started helps line them up. Be damn sure they are lining up though because this way of doing it could result in ruining the pilot bearing. You usually can hear a click or a sort of pop sound when the the trany and block mate correctly just shy of complete mating.

Headlight housing are all generic and will fit in the case of the single headlight on one side. (The double headlight system or the 4 headlight fronts of the older D50 type are smaller housing.

As for led light systems, I think that there just like a regular bulb replacement since they should have the voltage drop transistor already installed in them. If you like to dim your dash lights be sure you purchase ones that can do this. Some led are either on or off and dimming is null. Though it has been a while since I have looked into these conversions and progress moves so fast that they probably have dimmer ability, just something to think about.
Check on ebay for lights, again these are very generic in design and if different they will usually just be a brighter or slight difference in voltage.(usually nothing to worry about as long as the base of the receptacle is the same you should be ok.

Wheel spacers are used and I have heard folks using them. Though it may work on your wheel bearings a little harder in some cases. Might be better off with offsetting rims if you want a particular look.