44 yrs old
about 4 quarts
A 302 will fit with no modifications. I believe it is possible to shoehorn a 351 in with some mods.
Yes they should be if not you would only need to modify it slightly.
yes if you want them replaced
no
There were no Mustangs until '67.
In those years..they used 10w40.
for auto and manual its 6 degrees BTDC
.034
No, it's to wide, the largest that will fit is the 351w
5/8
.024 to .026 inch ( for the 200 cubic inch straight six cylinder in a 1966 Ford Mustang )