Putting fluid in your clutch slave and finding out how it leaked would be a big first step to your shifting woes!!
There are several manufacturers that make shocks for Europas. Spax are available from r.d. enterprises (and they're on special this month). I got Protech from SJ Sportscars (
https://www.sjsportscars.com/). They are almost too pretty to put under a car. The stock springs on the front were 2 1/2" but most of the other aftermarket shocks (such as Protech) take 1.9" - the same diameter as the rear shocks take. That might be a consideration. r.d. also sells uprated springs. There are a lot of different views on what spring rates are best. I run 250#/130#, another popular setup is 150#/115#. There are sure to be other. I'm not married to my spring rates but they are not harsh as you might imaging. You probably want 10" or shorter springs in the front so you can lower the nose.
As for bushings, the stock ones work pretty well. There are poly ones available for the front from here (
https://autobush.com/4/Lotus). The Elan and Europa front bushings are the same. When using the stock bushings, tighten up the nuts on the suspension at ride height so you don't tear the rubber when you hit a bump.
I met a guy at a LOG who did something I thought was interesting. He put sheet aluminum over the front of the fan except where the fan is. He said it made a huge difference both in coolant and cabin temps. I've also heard of sealing around the radiator hoses and anywhere else air could get into the frame. I have not tried either of these. I'm just reporting what I've heard. Some people here have put their radiator fan in the wheel well and reversed the rotation so it's a puller. That is supposed to be more efficient and it should pull hot air from the radiator away from the front compartment more efficiently.
Another thing that I haven't done yet is put a slab of foam rubber under the elbow cushion. There was one when the car was new and I have felt heat come from that area. I will be doing that when I find some.
My experience is that as long as there is air moving through the radiator, it stays pretty cool (below 100°C). I have an aluminum radiator I got from ebay (some are listed for as little as $69 so compare specs and prices). I have a fan controller with a built in relay that allows me to adjust when the fan comes on and also allows me to override the temperature switch. Other than that, it's pretty much stock (oh, ok. I have an oil cooler but I didn't put it in a very good location so I'm not sure it counts). I also use distilled water and Red Line Water Wetter with no antifreeze.
I'm sure you'll be able to sort these things out but it's a shame that the seller gave you so many things to sort!