318 Power, with real street manners ?

I have no payed with a few 318’s before. The trick to mileage and performance (with no goal listed) would be a cam under [email protected] and well prepped heads. I would certainly go right to a 2-1/2 exhaust after the headers.

Without porting the heads & dealing with the stock pistons with there low ratio, a cam at [email protected] would be a better fit than anything larger.

If 14’s in the 1/4 are OK with acceptable 17/18 mpg, then that s is the type of set up your looking at.

600 cfm
Dual plane
Well prepped heads
Headers into 2-1/2 exhaust
stock converter/3.23 gears on stock tires. If you increase the be tire diameter to 26-26-1/2 inches, you can move to 3.55’s without much in the way of a penalty and pick up time in the 1/4.
(Better traction and torque release.)