OK, then start with the rear sway bar.....shocks? Looks like the Hellwig is 3/4" only. That or 11/16" is probably as small as one would go on this weight range of car to be close....
I worry about the size , to big or to small and you end up with no gains ,could make it worse . Solid or hollow ? Was there ever a stock option in 70 ?
And the way they mount , there are different methods , or am I dreaming that ?