Yes, that is right on info.....the ring gear is the same on the flywheels(168tooth), for 10.4, or 11". If you are running a 250 L6, you can bolt the pcs on the back of a sb (anything but a 400 sb)...external balance on the wheel for that puppy. The 292 flywheel will not work on the back of a sb however. the 11 & 12 " clutches do use the same bolt pattern, but the good (hypo clutches ) , are 11 ". I run a centerforce dual friction setup on my longhorn.....they arent cheap, but you get what you pay for  If you are planning hard use, off road or racing....or even "spirited" street driving, I just cant say enough about the Centerforce clutches. they rock! 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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