Wellcome to the board, answer your question, when lowering a vehicle you MUST increase the spring rate to avoid bottoming out, second you will improve the ride and the handling, third it's the most economical/ functional way to lower your car, forth you old springs probably need changing any way.
On the subject of droped spindles, IMHO/facts, one of the worst things done to practical vehicles, the problems: limits back spacing options on wheels (big problems for Camaros), increases scrub radius, lowers the car without increasing spring rate causing bottoming out.
unless things have changed heidts only has one spindle, to fit 1st gens, 2nd gens, A-bodies how does that work!!!!???? for starters, ball joint tapers are not the same, outer wheel bearing are not all the same, bolt on steering arms, how many are available? do they correct bump steer on 3 different front geometries, do they allow for more back spacing, IIRC they are not even as tall as the stock 2nd gen spindles so it would affect the geometry in a negative way, not to mention special brakes.
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