Lots of threads about this to search and learn from, and I'm neither sage nor racer, but here's my .02 from having done similar to my 78 280: For looks/stance - Eibach progressive kit will drop you down enough to get a better look w/out rubbing or a harsh ride - nice street compromise in my opinion. Best bang for buck in performance will be a thicker set of sway bars - do both front &rear together. I did the MSA ones and boy, what a difference. Removed body roll and made the car track so much better. Both the above mods are pretty affordable and other than typical tools, you only need spring compressors and a pickle fork to split the front tie rods. You can do the whole thing on a Saturday in your driveway.