Newbie-question

[FH212]

Hello, Im new to this site and have done a little reading in some older threads.I am new to the pro touring movement but have been following it for a while.My question is about suspension .My Dad and I are thinking about doing some stuff to our 1970 Buick GS 455 Stage 1 hardtop.But with limited info on them where can I go? We want a new car ride out of it.Any suggestions.Thanks Richard