So I'm looking to buy a 292 that is stock bore but has 1.94 intake and 1.60 exhaust and a comp cams .488 lift with 212 duration and 113 lobe separation. My question is what kind of gas mileage would I get with a stock intake and exhaust and a t5 world 5 speed with a .67 over drive. I have a 1973 c10 daily driver with a 250 straight six that's getting weak and would like to go this route due to its a good price for the motor. Any help would be great.

Thanks