Concerning the 1970 Mach1 with white hood stripes,
Early 70 Mach1 built in the 1969 calendar year could have been built with black or white stripes regardless of exterior/interior color.
In the December 1969 brochures and the Armchair Estimator, Ford restricted white stripes to Dark Ivy Green or Black cars.
The 1970 Mustang dealer order form has two boxes to specify this.
I've seen a black interior car with white exterior stripes.
There is a letter code ( B for black or W for white ) on the buildsheet in section tape stripe ( hood stripe ), and section panels/opt.tutone ( trunk stripe ).
Ford produced 1,372 Mach1 with the white hood stripe.