1969 Dodge Dart - Fast-Blow or Slow-Blow Fuses for Fuse Block?

I am looking to purchase some extra 2A and 5A 1/4" x 1 1/4" glass fuses for the fuse block. Should they be Fast-Blow or Slow-Blow fuses? I have a package of 20A, but it doesn't say fast or slow blow.