Inline 6 is really tired

[Asshat]

1963 C20, 292 inline 6, stock distributor with Pertronix, 1bbl Rochester carb, 5-speed T5
Just drove this thing about 20 miles; pretty warm out today. Thing is, it’s gutless!! No power, climbing up a gradual incline is not good. After a few miles, the temperature started creeping up. Once I turned around, and started going downhill, it cooled off. When driving around town, the temperature is ok, always stays on the far left of the gauge.

And, these brakes drag- coming up to a stop light, I can feel it holding back when in neutral. If it’s level ground, it comes to a stop like my foot is on the brake. If it’s a slight incline, it stops, then starts to roll backwards.
Can’t wait to get that front end in here with disc brakes.