R = Vermillion Red.

1957's had single headlamps, 1958/60's had dual headlamps.

On an old engine, I would not suggest using a detergent oil as it will loosen up all the crap, which may plug up the oil passage holes.

Which oil filter does it have, the old by-pass cannister type that uses a 'sock' oil filter, or the full flow spin-on filter?

The spin on filter was introduced in 1957, but was optional. The spin-on adapter is still available, uses the Motorcraft F1-1A filter.