Firstly if you provide when the car was built we can provide more details as patterns an practices can differ throughout a production year
Some of these details have been illustrated in other threads - a good start might be to search those out as a starting point - remembering to look only at 65 Dearborn examples
I have my 65 vert going in for pain soon (finally). I have a few questions to guide the shop:
1) Do the front and rear wheelwells get any paint overspray?
Front wheelwells before sound deadener but after seam sealer some direct and some oversppray depending on what panels
Rear wheelwells - direct paint application over sound deadener
2) Were the cars originally painted with doors and fenders on or off?
Car unibodies were painted with doors, trunk lids and rear valance (all screws installed but hanging down ward at bottom - Dearborn) and (most time periods) end caps loosely/spaced outward approx 1/4-1/2"
3) Any overspray on any front or rear suspension and steering parts?
No installed till much later
4) How far under the car (floorboards) should overspray cover/ touch?
Body color or pinch weld black out overspray?
For body color depends on where on the floor your referring to. Differs also on the painter, possibly their height, age and effort that day. ALso the amount of contrast between the exterior color and the color of the floor board color from the firewall rearward makes a difference, visually. Normally there is a shadow produced by the pinchweld - then overspray between 2 feet inward to examples where heavy overspray was applied half way towards the driveline tunnel. At the rearend area/rear wheel wells it differs because of angle and shape of the panels
5) Do the backside of front fenders get painted in full or what is their base color on backside?
Depends - At least good coverage on the logical back surfaces directly behind the surfaces fully painted - Examples wheel lips, headlight & valance attachment face surfaces and the back edge at the door opening. To sometimes a fairly nice full coverage of the back side. IF we knew when your car was built we might be able to see what other cars were painted like around the same time.
Hope this helps