Sorry just internet short hand for "In My Humble Opinion"
Now that we know when and where if car was assembled we can work on your initial questions
" First, painting the undercarriage,I have MCA restoration guide. The underside is in primer only?"
The floors, as we understand the process at that time, were shot with a red oxide colored epoxy primer from approx the firewall forward, by hand.
The floor section, from about the firewall rearward was shot (around ser # 117xxx) with what is referred to as "batch" paint a mixture of primer and left over exterior paint (this often produces something along the line of a greenish or blueish medium or dark gray) .......................
or a different batch of red oxide. Of course if you cleaned and documented the original finish of the floor pan you will find out exactly what was used.
"Some overspray and sound deadening? "
You would have over spray on the front frame rails from the engine compartment black (one of the last paint applications), body color over spray from the painting of the exterior body (heavier towards the rockers and less to nothing as you move towards the center of the car) ,...........
(Not all 69's but typical applications)
................... black overspray (not as far in as the body color overspray) from the pinch weld black out) - the last paint application on regular Mustangs
(Not all 69's but typical applications)
Sound deadner application (before or after specific paint applications) depends on where. Rear wheel well sound deadener was applied (for example) before exterior body color but front wheel wells was done after all painting and after all body panels and suspension were installed in an effort to seal and quiet road noise and water.
"The cut off between black in engine bay and undercarriage? "
Anywhere (depended on the age and height of the guy applying the paint originally) between the surface/face of the firewall and the floor pans. Normally IMHO fairly heavy over the top section of the angled section of the floor pan to light near the bottom . It's not an exact point just a range
"Anyone have pictures of concours resto undercarriage?"
Sorry don't keep pictures (generally) of restored cars since the vast majority of them stray (a little or allot) from what they were originally. Prefer original unrestored examples![]()



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