What kind of heads (top and bottom) should I be looking for ?Should I look for an old Speed King ?
Choosing drum heads can be stressful, because there are no returns. I'd hold off on picking heads until you get the missing parts and the shells cleaned up.
It's time to mention, never use any type of steel wool on any part. For the chrome pieces, forum members have had good results with Simi Chrome polish or Flitz (non-toxic). For the wrap, members have used a good quality car polish/wax. Another great product is Novus. There are 3 different levels. #3 for deep scratches, #2 for medium/light scratches and #1 is a cleaner/polish. I've only used #2 and #1 and it works great. It is sold individually or in a 3 pack kit. Harley Davidson dealers should have it in stock. Do some searches on the forum for other threads on cleaning and detailing, because there are hundreds. If you have questions before you attempt something, please start a thread.
While cleaning, be careful with the bearing edges. To some, these can be considered the "heart" of a drum. If you have concerns or something doesn't look right with one of the bearing edges, please post your question with pictures. I only mention this, because the pictures you posted show the drums without their resonant heads/hoops. Don't know how long they've been like that, but there could be minor nicks in the edges. Altering/fixing the bearing edges, if not done right, could turn it into a player's drum and the loss of hundreds of dollars in value.
If you want to look for a Speed King to finish off the period look, that's fine, but not necessary. Some people love them, and some people don't. It all a matter of preference.
I know, based on everyone's comments, it sound like these drums should be sealed in an air tight container and that's not really the case. We're just giving you detailed pointers that have been tested and known to work based on the many cumulative years of member experience. I'm not a vintage drum expert and have only been doing this for 3 years, but if you follow the advice within this website your kit will look great and retain it's true value. Since you decided to keep the kit, I think you now understand you have something very special that many drummers would only dream of playing, let alone owning.
I've only been discussing the drums, but you have those K cymbals too, which is a whole separate topic. ;-)
-Tim