if the 68 has a saginaw 3 spd(id by a 7 bolt side cover), it will be a direct swap with a short 350 turbo(6 " tail housing). The spline will be the same, no driveline mods. One of you will have to swap crossmembers tho......the 3 spd stick will bolt to the auto crossmember, but the stick has a bell mount crossmember & will need to be changed to mount the auto trans. If the guy has the Muncie 3 spd(4 bolt side cover).......you dont want it! they are a weak trans. 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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