I guess the center bolt valve covers are just a personal, cosmetic thing. I've seen the adapters for about 100 bucks or so.
It's really a matter of flow over cost/work. the 193 aren't perf heads but they will do the job and with very little work and cost to make them run but the 882 can be used as a decent perf head, atleast more than the 193s, but I would have to spend a few more bucks and a little more work.
Thanks for the suggestion though!