New to the Flathead game and need advice

[Rick Gibbs]

Hello Everyone, I am new to the Flathead V8 game and could use some advice. First I got the truck from an individual that had done a lot of the restoration. He was very very meticulous about what he was doing and did a very good job. The family said the truck’s engine was said to have been rebuilt about two to three years ago and is doing very well for the truck. I have placed a Oil filter system on the truck.. what oil do y’all recommend? This will be the first oil since the oil filter system was placed on the truck. It is a weekend driver and special events. Question 2 The transmission was not rebuilt and I am getting a stuttering in the truck when starting off. Some say it is the clutch and needs to be adjusted. One person has told me to change it out with a S10 transmission. I like the original transmission but would like to cruise at 60 mph with a low RPM and they say a S10 transmission will give me that. The truck currently will go 45 mph to 50 mph but it is turning a high RPM to get to 50 mph. So my current game plan is to run none detergent oil something like a 10w 40, change out the rear gearing ( key note is I have never attempted to change out any rear gears in my life and the master “my dad” has passed.) I have looked at rear gears from speed way motors. I have just changed out the point distributor with their product and could not be happier with it. If I change out the rear gearing I would want to keep the old transmission and get the old transmission rebuilt with new clutch and pressure plate etc.. What does everyone think? Sorry for needing so much advice from the group already. Thanks in advance for the help.