The Summit and ebay ones have no baffles. here was a thread that the guy migged in baffles to his offy valve cover.
http://www.forabodiesonly.com/mopar/showthread.php?t=99216&highlight=offy+valve+cover+baffle It turned out sweet. They also show a way around it over there
http://www.slantsix.org/forum/viewtopic.php?p=80165#80165.