Top 5 A-body mods...

discs off 73-6 A cars, go up one size wheel or 2 sizes ( 13 to 15 or 13 to 14),( rebuild front end is not mod just maintainance, to me) tack, aluminum rad if old one is iffy, auto to 4 speed, upgrade rear if only 7 1/4, sub frame connectors, mechanical gauges under dash ( o k so i'm old s chool), upgrade wiring ( Mad deal),, change t bars if going from slant to S B or whatever.