Overdrive is the ticket here. In 1957 i rode many miles in a '53 Plymouth Belvedere with a 265 cid Chrysler ("long block") and overdrive at more 100 mph. That lovely piece would bury the speedometer needle, and with five of us aboard once made the trip from Abilene, Texas, to San Angelo--89 miles on two-lane--in 62 minutes. Don't try that with a stock Plymouth--even with an overdrive!--but overdrive will surely increase the cruising speed.
God's Peace to you.
d
Inliner #1450
