Hard starting

Took the wife out for a ride this morning and stopped for breakfast. When we went back out 30 mins later we had trouble getting it to start. I could hear the starter turning and the battery isn't dead. It has a new solenoid, new Ford Racing mini starter and new alternator.

I searched on here and read about the starter getting hot from headers possibly causing slow hard starts after its hot, I do have headers. But with a mini starter the headers aren't really that close to the starter. I finally got it started and it ran like normal after that. Any thoughts on what could have caused this?

I realized that most of my drives are out and back home without stopping so I'm not sure if this is something that would normally happen if I made some stops while I'm out or if it is something new.

So if it doesn't sound sluggish when it's trying to start that would mean it's probably not a bad ground and more likely fuel boiling in the carb? I do need to replace the ground cable from the battery to the block but the battery terminals are crud free.
I do have a spacer between the carb and the intake.