If you click on this picture you will see my other pictures that were taken at my good friends house, where we did the swap from the 305C V6 to the 350/350. Those are Flowtech full length headers with 3" outlets which I have put 2 1/2" reducers on for the rest of the 2 1/2" exhaust system.
Here is the sound from the inside during
acceleration  185 kb.
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Exhaust Recordings
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350 V8
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NP-435 Tranny
Few revs  139 kb.
Start up  220 kb.
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Here is what my 350 sounded like with the 2 1/2"  3 chamber 50 series Flowmaster mufflers on it.
These are with the new 2 1/2" Turbo Tubes. They sound so good!!
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Inside cab  139 kb.
Engine Specs:
-  1975  Chevy 350 4 bolt main bored .40 over so it's actually a 357.                    
-  9.75:1 Hypereutectic pistons.
-  It was remanufactured by Evergreen Engines of Spokane Washington.
-  ARP (Automotive Racing Products) connecting rod bolts.
-  Aluminum oil pan.
-  Pro billit MSD Distributor.
-  8.5mm MSD spark plug wires.
-  NGK spark plugs.
-  Aluminum crank, water pump, and alternator pulleys.
-  Chrome 1 wire alternator.
-  Edelbrock aluminum valve covers.
-  Edelbrock air gap rpm aluminum intake manifold.
-  Holley 670cfm street avenger carburetor.
-  Pete Jackson "noisy" gear drive.
-  Aluminum timing gear cover.
-  Flowtech full length headers with 3" outlet with 2 1/2" reducers attached.
-  K&N 14"x 3" air filter.

Hard acceleration with recorder held outside the cab window  238
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Here is the mild burnout I'm sure you will want to hear :)  230 kb.
Cam specs:
-  Comp Cam (Compitition Cams)
                                  
Intake                Exhaust
-  Gross valve lift          .480                   .480
-  Duration at .50           230                    230
-  Lobe lift                    .3200                 .3200
-  Lobe separation                      110.0


Transmission:
-  TH350 rebuilt.
-  Shift kit
-  Hardened race second gear ( so it doesn't break as easy when down shifting hard from 3rd to 2nd.)
-  C9 HS billet torque converter with 2500-3000 stall speed.
-  Controlling this transmission is a B&M Truck Megashifter that is ratchet action.