I run the 3.75x3.75 in my 66. It is a super 55 engine with the late 550 head, manifolds and carb. The head is shaved .100 and everything else is stock. It pulls really well most of the time. You can see it pulling on youtube. 2014 Pa Farm Show Antique tractor pull - YouTube. It won the 3,000 and got 2nd in the 4,000. Lots of fun!! I use Sunoco 89 pump gas. I don't have the PTO in it so I don't know what the HP is, guessing more than 50 @ 2600RPM. Your 77 should be 60 or better at a lower speed with 3.875.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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