This was a term that Ford 'borrowed' from Ferrari. It meant that the car was basically a two-seat sports car, but it also had what could be called two back seats. The back seat of a Mustang could comfortably seat a couple of hobbits, but not two normal sized adults. The car had two seats, plus two seats. A 2+2.
44 yrs old
about 4 quarts
Yes they should be if not you would only need to modify it slightly.
no
yes if you want them replaced
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front
There were no Mustangs until '67.
In those years..they used 10w40.
No, it's to wide, the largest that will fit is the 351w
for auto and manual its 6 degrees BTDC
.034
5/8