1968 '340' Barracuda vs 1968 '383' Road Runner

EL 5 Demon,

The 1968 Road Runner '383' was only available with 3.23 or 3.55 Gear Sets.

Even the 'Sure-Grip' was an option on the 383.
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In 1968 > 3.91 Gears were only available if you knew someone at the Regional Zone Office.

They had to be 'Special Ordered' by the Regional Zone Office.