Acceptable 4 series upgrades ? (401)

[Des]

I'm at the thinking stage of similar uprades, I have yet to buy a servo, did get one for another car a while back which was a Lockheed copy, it looked well made and worked ok but within 6 months the vacuum hose supplied with it had perished and rotted, I then discovered the little air filter that sits on top of the extenal diapragm wasn't a filter as we know them but a short plastic tube with tiny holes drilled randomly, the swarf still attached, do look out for this as the thing looked fine otherwise.
I've found that some old lucas clip in bulb holders for the 382 indicator lamps fit in the front foglamps fairly well, the rear lamps are a bit compact so I'm thinking of sacrificing or relocating the reverse lamps for indicators, maybe brighter to compensate for size. I used to have a late '80s Toyota Supra, front indicators were mounted low and not very effective, I constantly had people pull out in front of me when turning right on mini roundabouts, 50 watt halogen bulbs cured the problem, possibly something like this will allow me to use 2/3 of the rear lamps to double up on the stop / tails.
I've held various mirrors against the car trying to decide, the funny little clip on square Stadium branded ones don't seem too effective, round convex Raydot or Lucas ones seem good, but will involve drilling so it's that or install a radar system.
My plug caps are also 5000 ohm, out of interest they're the originals, if you have resistor plugs as well it could provoke trouble, tracking at the leads, rotor, coil, or they can just decide to track anyway. condensors often seem to give trouble these days, even when new.
The wipers are at best pretty lame, well up to snuff 60 years ago but with every second third and fourth vehicle now running diesel there's copious greasy, sooty, carcinogenic filth being smeared across our screens, I'll be trying to make some modern rubber fit the blades and increase the arms spring tension a tad, do check your blades are doing the 'flip-flap' thing at the end of stroke, twisting the arms if needed can make a great improvement, and make the best of it by keeping your screen very clean.