Sportsandspeed,
Wow! now you really have an old classic home made track.
From the photos you posted on the 2nd and last photos showing the under side of the track sections,
like you, I think you have some missing parts..
To me it looks like some all thread rod with washers and nuts could be used to hold the track sections together.
You say you have 6 conduit poles with holes drilled in the ends that are about 6 ft long?
Having 6 of them makes me think that these are the track legs. (but then you never know!)
if 4 of them were longer and 4 shorter? (or so on!)
Think of the 4 longer conduit poles as the (x) or crossing braces for the legs.
Does your track have holes or mounting plates along the sides of track on the start sections for the legs to bolt to?
If so you may need to run down to a hardware store for more supplies like nuts and bolts if these are missing as well.
As much as I hate to say it i'v been in your shoes with an old wood tack myself.
You never know what parts are missing or if you have them all to set the track up.
I had to put lots of work into this track to get it ready run any cars down it.
It was in very bad shape when I got it off a pack in my area.
A total top replacement and lanes rebuild had to be done.
photos of track..
Don't know how well you can see the track section clips on this one.
But it uses 2/ L shaped brackets with holes drilled that the sections bolt together,
with long bolts and wing nuts to hold the sections together.
Here is a close up pic of one of the track section brackets.
Even the start gate was a total rebuild.
Just trying to find parts to get the ol' LaneBrain up and running was a challange in itself.
Good luck on getting your classic track together Sportsandspeed,
Mark.