You want loud? Run open pipes! I run the 40s and its plenty loud enough for me. I don't know about the SBC super comps but the BBC super comps are huge and you better be moving enough exhaust for them to function properly. If this is a pump gas street 350 you would probably have more power(tq) with the comp headers. Do you spin at 7500rpm? If not I think the super comps are hurting you...

Two cents and good luck,

Chris