The only reason to buy a distillate manifold would be to do a "correct" restoration. They are hard to come by in decent shape with the heat butterfly intact and working. So, if you are just interested in making her run right, buy a good used gasoline one, or a new one if your pocketbook allows.
On the valve front, I would take the valve cover off, and give all the valves a good coating of clean oil. Sea Foam. Blaster. marvel mystery oil. Really whatever your favorite oil is. I am not trying to stir up the penetrating oil (snake oil) debate, just giving you options. Personally, for something like sticky valves, I like MMO, but each has their own opinion. The important thing is to get the valve stems and guides thoroughly lubed. If the old girl has been sitting for awhile, a sticky valve is NOT unusual. Kerosene or diesel would work as well. Important thing is that the oil used is low viscosity.
I like to take the valve cover off. Give each valve a good soaking in MMO, while occasionally turning the engine over by hand. Making sure each valve is moving, and coated. Best way is coat, turn 1/4 rev, coat again, another 1/4 rev, and continue until you have turned her over through the whole intake/exhaust cycle for all 4 cylinders. you can even do it with the engine running and the valve cover off. either way, get those valve stems and guides lubed.
If that doesn't solve things, let us know and we can go from there.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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