New Super Stock Springs with appropriate shackles
3 way adjustable shocks all the way around, front loose, back tight
Recurve distributor to have advance all in by 2800 or so
Tinker with cams and squirters in carb
Consider borrowing an original Torker or Torker II intake

Will be lots of naysayers on the intake recommendation but I messed with a 65 Coronet for 3 or 4 years and tried several different combos. The main goal is to get it to sixty foot as quick as possible, all the recommendations above will do so. The car I ran was 3750 race ready, 440 0.060 over, 528 crane hydraulic cam, KB 236 or 238 pistons (no more than 10:1), unported 906 heads, single 850 holley race carb. Went 11.80s, low 1.60 60 foot times on a consistent basis and on a real good track went 1.58. Took several years and messing with things one at a time as previously suggested, but these are real numbers not just a keyboard jockey throwing stuff out there.