First of all I would be more concerened about performance than sound.
Having said that I would go with a XE256H or XE262H.
These shold put you right in the good performance, good sound catagory. Especially with your headers and free flowing mufflers.
Need a little more information on your set-up gear,stall,etc.
Call Comp Cams,give them all your info. See what they say. Bet I'm very close.