Can I get some guidance on suspension choices?

[Austinbelair]

My father and I are about to re-start our 56 Belair build and I know there are pretty much no tri-fives on here but you guys are knowledgeable and I have nobody else to ask.

We won't be auto-x'ing the car but I do love some spirited driving the corners. I will probably be pushing it hard but my father will not so I am kind of stuck.

I need to get something figured out and ordered so I can get someone to install all of it.

Right now I am looking at Heidt's Triangulated 4 link setup or the Art Morrison Tri-4 Link. I've been reading that parallel 4 links are more geared toward drag racing and that will not be happening with this car at a track. I've heard a track-arm would be a sweet way to go BUT nobody sells a kit for 55-57 Chevy to run that. So far, it seems my options are this:

AME Tri 4 link
Heidts Tri 4 link
Air Ride bolt in Parallel 4 link

Front suspension will be Tubular uppers and lowers with coilovers and rack and pinion or the regular 500 box setup with a fat sway bar.

I've already got the car mini-tubbed and will either run the stock housing with aftermarket guts or buy a Currie 9" setup.

In laymen's terms, what rear suspension do I want?