Lee:
I'd do what Jim and Marc did ... especially if you aren't sure you'll be tracking your car seriously.
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For the strut tower tops, I'm staying with whats in my car. You can get monoballs and other aftermaket units that will give you more neg camber, but this tends (IME) to be more of a racing type upgrade more than a "they just wore out" kind of thing.
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I agree with Chris, in part ... You can "adjust" for a monoball strut tower bearing / mounts by setting up your torsion bars and strut insert combo to do all the "heavy lifting." (I think the OEM gives up a little in deflection in order to prevent vibration / road noise transmission throughout the front-end). I've been in street cars with monoballs they are still an OK ride. If anything ... their harsh ride usually comes from over aggressive TBs /track revalved inserts or either of the two mismatched with the other. If you need it ... you can get more camber by widening the slots / mounting holes in the strut tower for the OEM strut tower mounts.
Forged versus cast mounts:
IF you do get the strut tower monoballs / mounts get the more expensive forged pieces as I have seen and experinced off track excursions (as have others) with the cast pieces which break (shatter) when the suspension travel runs out (very suddenly) such as encountering an off track object ... like say an armadillo
(seriously ... hole, rock, apex curb, alligator bump, etc....). Ask Dave McMahon (I think that is his last name) who runs a yellow crinkle coated IROC look-alike locally.
I'd also add that besides the ER poly-bronze and/or P-Products neatrix rear bushings there is a third option for the street: The Weltmeister sway-away rear spring plates with red poly bushings. Your '78 SC has adjustable spring plates from the factory so ... you probably wouldn't want to spend the $ on these.
However: IF you have a pre-77 car and / or you want MORE adjustment on the spring plate for corner weighting and ride height adjustment than the '77-89 OEM spring plates, THEN this is a good option. I have them on my '76 street Targa and they don't squeak, groan a little but can only hear when the car isn't running. My '76 had NO adjustment from the factory on the spring plate. Caveat: the red poly bushings for the sway-aways are unique in size and NOT interchangeable (without some work) with the neatrix or OEM.
FWIW I plan on using the ER poly / bronze when I redo the front end on my '76.
Jase