Slow cranking 70 GMC Help

[70gmcfs]

Hey everyone, I just bought this 1970 GMC C15 and starting to do some work to it and get everything working right. Right now I'm trying to figure out why it is starting up so slow, it has been like this since I got it. It is a 307 with a 3spd that was on the tree and I converted it to the floor, still has the points system and external voltage regulator. The points all look brand new, same with the spark plugs and spark plug wires, I just put a new coil on it as well. The battery cables don't have any corrosion on them, however do look old(going to be replacing them). I was looking at the solenoid and there is one wire that is on it and it looks like somebody stripped a wire to put that one as well or it fell out of its connector(can't tell what the colors are yet). Is there supposed to be two wires going to the solenoid on this? Could that maybe be the issue? Any help would be greatly appreciated. Thank you in advance

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