Choosing pistons

The 42rh will need to built up for your HP, but yea the upper hoop needs to be removed. Here is a thread detailing it: 42RH / A-500 in a Duster with pictures.

You can also buy the crossmember already built from US Cartool.
That's great! Had no idea. Wanted to run the 46rh but didn't want to cut up my new amd floorpan. Now I won't have to. Thanks :thumbsup: