Softest Suspension for 69 camaro

[rbr4155]

Hey Guys,
Just got my 69 finally and man does it take a bump hard. I'm looking for the best bolt on mods I can do to make this old girl take a bump good while keeping her low tough stance. It isn't lowered too much though. Are air ride better than gas? What can and do i need to switch out? Polyurethane bushings, which ones and are they hard to swap? Thanks tons for your feedback in advance. This is going to be a big help in getting this car closer to where I want her.

Thanks,
Ryan