I had a set of Performer RPM's on my Camaro's 350 great quality out of the box and worked well all the way up to 6400 RPM with my cam/intake combo. Id throw another set on the Regal if it was in the budget.Nothing wrong with a pair of edelbrock performer or performer RPM's.
i have a pair of performer rpm's on my 383 and they are pretty sweet - performer rpm 64cc roller