1970 Chevy c10 327 First time

[1970/327/c10]

Ok first time posting, Start this out with what pickup i got; I have a 1970 Chevy C10 with a 327 small block. Its in excellent condition. Thought this would be a good place to ask questions and let you guys know what im doing to this pickup. The motor is getting rebuilt so ill have a fresh motor and the even better part is that i get it for free; by the way Im 15. One question i have is what kind of fuel mileage would i get with this combination, it a automatic. I have no clue on what it will get. My plan is lower it and put some nice rims under it and paint it the two tone style (Maroon and White or cream). Im on a tight budget but for now i will just paint it in the near future and put some rally wheels on it. Then when i get extra money lower it. Ill try to get a picture of the pickup on here soon.