Let's quantify what the problem is. What mileage are you getting? What size tires? Is the speedo and odo accurate?, lifted? Etc.

No go on the 833 if 4wd, the only vehicle that used that combo was some early gm diesels. You're not likely to find one for the tail housing.

Is the dist tuned with a good advance curve? Carb jetted right?

Angry white pureblood male