I'd suggest the nodular cast iron diff covers, since thats what the axle housing is made of - like Solid or Rockcrusher. Poison Spyder, Riddler & Crane also qualify, and you probably have enough bumpstop extension in the rear to keep them from hitting the gas tank if the LCA's are stock length, but others might not.
Realistically...these options are smarter.
Four X Doctor (or something like this)
Also keep in mind you can get a 3/16" thick stamped stock cover from the junkyard out of pretty much any late 70s/early 80s Chevy, Dodge or Ford with a D44 front.