Bore to stroke ratio is the relationship between the width of the piston and the distance it travels.
My Mopar Performance book says the best ratio for circle track is 1.5 - 1.75 the best ratio for
drag racing is 1.75 - 1.85
318/340 ratio is 1.85 and the 360 ratio is 1.71 so i don't think you have to worry which is best for your street machine
