This is the difference according to those wheel sizes (ideal, the rusults would be different if the tires are compressed more, or different tread depths)

old speed 80 mph (128.72 kph)
new speed 79.08 mph (127.24 kph)
difference -0.92 mph (-1.48 kph)

1995 V6 SE MTX
1998.5 CSVT
1963 Riley Elf/Saab 2.0L Turbo swap
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