Taking the factors of the amount of text that was needed to be on the poster for the format, and the idea that this was to have something of a retro feel, I've combined them into these roughs for you to take a look over.
Each of these can be converted to business cards with a little work and can the final choice can be changed to an ad/flyer with just a little bit of work.
Variation 1- Rough concept
Refined a wee bit, finding the yellow bands a bit distracting.
Merged style experiment
Variation 2
Darkened up the text..
Third variation
And a final Fourth variation.