Run a 3" X and mid pipe. Mufflers with a 3" input and 2.25 or 2.50 exit and tail pipes.
You will not notice the minuscule (if any) power loss by running smaller tail pipes, especially on a cruiser.
I had the same setup with 600hp in my 73 gto and worked great, and still pushed the heavy beast to 11.3 qtr mile.
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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight
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