3" pipe wont hurt on that big caddy, but will be loud as he!! You might go 3" in, & 2 1/2" out of the muffs, & add an H pipe to mellow it a bit. I think a set of Dynomax Hemi turbos would be the way to go on that one.....she will still sound off! The 4.88 gears are way too deep for a Cad.......they have gobs of tork, but are done running around 5000 rpms. I would suggest a mid 3s gear to make the most of the combo. Good luck,crazyL 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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