Only 18,512 R/T vehicles remained after over 73% of the cars were bought in basic trim level. 

Just 6,231 vehicles were ordered with the bigger 440-cubic-inch (7.2-liter) RB and 426-cubic-inch (7.0-liter) HEMI mills, 

while the majority of the latter came off the assembly line with the 383-cubic-inch (6.3-liter) V8.

With only 356 built, the HEMI is perhaps the rarest 1970 Challenger. Only nine of the 60 vehicles ordered had the SE option as well. 

With just 2,035 units produced, the 440 Six Pack variant is even more uncommon than the standard four-barrel 440, which was installed in 3,840 cars.

 Furthermore, just 2,399 street-legal versions were produced during its brief time on the production line and sold.