I am going with the Preacher!!! The gear is a little tall to be going West...some pretty tall hills on your way. I would want 3.23 or maybe 3.08 and about 2500 rpms at 70 mph. My cam is 519 lift and 262 degs. about the same as yours and my sweet spot is 2850 rpm with 20 inchs of vacuum.. I still feel you will be lucky to get 18 mpg. I don't think there is a ounce of difference on what intake/carb you have on it as long as you are driving for gas milage only and not making a few top end pulls !! LOL ...just saying.

Jerry Davis II#4711



ol Smokey said "one test is worth a thousand expert opinions."