To give my tuppence worth read on.
You could get away without a TDC guage if your really stuck. A long screwdriver down no1 or no4 spark plug holes can give a reasonable indication- and as I'm sure you're profficient it should be no trouble.
EB Spares and http://www.gazzella.cc/cart.php
are good places to get Colombo and Bariani cams from (though hopefully the AO shop will do these soon). I wouldn't bother with the high torque ones though, one of the chaps at Aidie Hawkins Motorsport tells me you won't go any faster with them- go for the high power ones
I can recommend the C&B cams- made a good difference to my 75TS
I can also recommend a Squadra remap. A new chip in my 1.8 155 means it outperforms the 2 litres
About the squeak; are you sure it's not the belt. Wire brush the pulleys and belt, or even change the auxilliary belt.
Check the wishbones bushes for wear by rocking the roadwheel at quarter to 3 with the body jacked up. Usually it's the front bush. I've just got a Superflex bush kit from EB for about £52 + vat and postage.
Try resetting the tracking to the maximum recommended toe-in. If that still doesn't sort things, try Magic Camber from Monroe (its in the catalouge). It's just eccentric bolts but offers adjustment. A strut brace should provide the extra ridgidity to stabilise the geometry on a hard worked car- beware oversteer though
Oh, and try some quality tyres (I'm assuming you have been using fairly cheap tyres). I know tyres are down to personal taste, but if you were to use a true tracking tyre, I'm sure that like myself, you would find improved wear simply because the car isn't sliding at every