I've only ran it with Open Headers when i first put the engine in the car. Never drove it with open Headers as it was REAL LOUD.I have a 3" Exhaust with Magna Flow Mufflers ending before the rear axle. I put some Resonators on it Right Before Thanksgiving but i don't think it's much Quiter which is what i was going for. My Brother had a 74 Comet with a 351 Cleveland in it but the Shock Towers were cut back some for clearance for the 351 Cleveland. My cousin has the Comet now with a 306 SBF with Trick Flow heads. He did have a Vortech Super Charger on it but sold it to our buddy. My cousin had a Pretty Basic Flat Piston .030 Over 351 Cleveland with 4 barel Closed Chamber Heads in it with a Torker Intake 750 Holley Comp 294 Solid Lifter Cam [Not a Roller Cam] 4.56 Gears and a C-4 with i forget What Stall Converter and it ran 12.30''s @108 mph all day long.That is quite amazing! The 302 in my Comet and Maverick was a b#@$h to get long tubes in. And, I had to wrap them to keep from melting the plug wires! Running it uncorked was a blast as I'm certain it is for you in the Mustang! I know I've got pics somewhere of the Maverick or my son does. I'll look for them and post em. BTW, I ran a single plane offy hi rise with a 650 Holly. 3" outlaw hood scoop.
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