some of the 3spds werent full syncro either. The saginaw 3 spd was a full syncro(identified by a 7 bolt side cover), but the old muncie 3spd was not syncro in 1st gear. If memory is with me that one had 4 bolts on the side cover, & that may be what you have in the 67. You can shift em down tho......put it in neutral & let the clutch up, then rev the eng a couple times, then push the clutch down & shift it down......be careful tho, if you miss on the rpms, it will make a mess out of that box! 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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