j arm frames are 7lbs lighter than a a-arm frame. By going to a single a-arm youd be cutting out the upper j-arm mounts or a-arm mounts. So if your doing a single a-arm it doesnt matter which frame you start with, as youll be cutting them the same.
Only 2 drag banshees last weekend at the biggest weekend of the year on anchor bay.
http://vid1191.photobucket.com/albums/z463/wtscheel/20150301_150316.mp4