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It used to be easy to walk into any auto parts store and get what you need but not so much today, The LN3 was discontinued in 1990 and while similar to the Series 1 there are some small differences. You will want a gasket set for the timing cover, which should have not just the case gasket but also a new crank seal, new o-rings for the heater pipes and maybe one for the oil filter adapter but that can stay in place when the cover is removed. Definitely replace the magnet if doing the timing chain set, also called an interrupter. Replace the formed water bypass hose which connects the intake manifold to the water pump area. There is no reason to replace the harmonic balancer unless the rubber face is getting cracks in it or missing pieces. Yes, replace the CPS. The timing chain set is up to you, but I have always recommended the genuine GM part, chain made by Morse, due to the smoother top surface which rubs against the plastic chain damper. Be sure the chain damper is the correct one, not just the style. There is one for counter-bored and chamfered bolt holes. Usually the chamfered is the correct one. In case it comes up while gathering parts, it is a three bolt cam.

No casting numbers I know of. As a matter of fact the block for the S/C engine in my car now is an 88 and I used a chain damper for a chamfered bolt hole. Balancer should not require a puller. Sometimes it requires a little help but not a puller. The bolt is reusable. A little medium strength (blue) Loctite on the threads on assembly.

You might also try installing a camber bolt that will allow for somewhat more camber adjustment then the OEM bolt in the knuckle. I like them because the installation is so easy and once in, alignment shops do the camber adjustment as part of the alignment without any additional charge.

I would take it to the alignment shop and get some actual numbers on it. There isn't anything special about the front end on the Reatta and if it aligned properly before the new struts, it should be no problem at Firestone