67 C10, keep 292 or go to 283?

[davidh]

I have a fairly original 67 with 198K on it. It needs quite a bit of work but for the most part the body is decent, has protecto plate, owner's manual, where it was bought etc. It needs work but I drove it home for $300. I'm debating to keep it original and rebuild the 292 or drop in a 283. I want this thing to get around 17mpg or more than my trucks with 350's get anyway. It has a 3speed and prob a 3.73 rear. It will used to work with but won't be abused as it had been previously.