Maybe beating a dead horse on 49-54 4 link install Q's

Ok guys, I am gonna 4 link & bag the rear of my car, its already c-notched using gambinos notch. I am on a budget here so I am asking your thoughts and opinions on what to do for a link kit...I was gonna pick up a triangulated 4 link kit from this place, there are a few options on length though, 29.5"/10.5" arms...23.5"/17.5" arms 24"/24" arms & 26"/22" arms are available in these kits..Is there one I should be looking for over the other? I dont want to loose my backseat or have to modify the entire rear floor to install it...thanks

Also if I am currently running a leafspring setup could I just load the rearend to ride height and tack all the bars into place and then unbolt the leaves and check travel clearance/binding issues and then burn it in completely and remove the leaf setup?

http://www.ebay.com/itm/360812642013?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

 

http://www.jalopyjournal.com/forum/forumdisplay.php?f=60

 

there is tech in this section also, but thanks