Both are factory; torx type are later. I don't know the year of the changeover to torx.
But, the ones that were on all the 68 and 69 cars I have had were Allen head. I always replace them with the torx type because the hex type strip too easily.
Robert
AAR 4-speed 3.91, Tor-Red;
70 440 6 pack Roadrunner 4-speed 3.54, Plum Crazy;
68 Formula S conv 383 4-speed 3.23, Electric Blue;
69 Barracuda conv Slant 6 OD4 2.94, 71 B5 Blue;
78 Lil' Red Truck, Red;
70 Challenger S/E. 505 6 pack, Passon 5-speed, 3.55, B7 Blue
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