No, 2 differen't body styles.
Yes
Yes I have a 64 and repairing the quarters with 65 skins. They are identical.
Yes. They should bolt right in.
A standard Chevelle frame will not fit an El Camino as it was based on the station wagon frame
'64-'67 Station wagon or El camino frame.
Short answer is no. The '64 was one year only, came to a point at the grill that was integrated into the shape of the hood. '65 hood will fit '66 and '67.
yearone.com and you can use the fusebox from the regular 64 chevelle, it's the same.
about 250 horse.
64-65-66-67 chevelle.
That all depends on the shape it's in, your best bet is to take it to an appraiser.
you need a chiltons repair manual from the library for 64 chevelles
65 66 and 67 will interchange.