That mach1 is very early built also 68 lens back up lights but note no dual exhaust chrome tips and unlike most people think all mach1s were 4 barrel with dual exhaust not so as u could special order a 351w 2barrel mach 1 and it would come without dual exhaust like all 2 barrel cars did.
Like ours is an "H" code 2 barrel 69 Mach 1, and Yes it is single exhaust.
The Mach pictured is a single exhaust Mach, you can see the tip right under her feet. My Mach is the same exact way.
From what I've read over the past 20 yrs, the "H" code was the base Mach 1, not a special order.