If the valves are too tight it will pop and sound bad, but it will also not feel good and not rev very quickly as most of your power goes out the exhaust. Good Luck, and let me know how it works out, those new FRP covers look very nice, I like them as weel but I want a set of nice sheet metal pieces.
------------------
Check Out My Site 91GT,Holley SysteMAX II Kit-Heads 2.02" x 1.60" port matched to a 1262,Anderson N-61,24#,76mm C&L,Full MAC exhaust 1-5/8" Long tubes,2-1/2" O.R H-Pipe,2 1/2" cat back, No A/C or PS or emissions, 12" K&N Filter,RNH PERFORMANCE Ram Air,Ron Davis Radiator,Full Suspension,S&W 8pt "X" brace,JAZ seats,3:73's,Welds..etc,4:30's and 31 splines coming very soon!