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i'll tell ya , if you want in the range over 500 to 600 horse range, you better strap a couple of 55 gallon drums in the bed of your truck on top of the gas tank your truck already has if you want to go 100 miles before refilling. your gas mileage will only be if your lucky 4 to 5 miles a gallon ( if it's going to be a daily driver ). if you have money to burn go with a crate engine. coast high performance has a 545 cubic incher i think it was over 600 horse power. but if you want good all around drivability and still get decent gas mileage stay in under the 500 horse range.