I know they do tend to be longer. Which are better the longer or shorter glasspacks, or is there a change in sound? 
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1968 GMC
Original A/C, bucket seats, PS,PB
396 bored to 402, Dynomax cerama-coat headers, Super 40 Flowmasters, 272/284 Crane cam, Crane gold roller rockers, holley 750 cfm double pumper, Edelbrock Performer RPM intake, HEI ignition, 9.5:compression
Alltogether 411HP and 446ft/lbs
Dana 60 w/ 3.54 gears
Turbo 400 tranny
Why would you have anything other than a big block? HAHA
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