/6 or v8 swap?

I have thought heavily about a turbo. Whether it's on a /6 or 318. Plus, with a/6, I wouldn't be able to leave well enough alone and I would have to push the envelope to see how much power i could get out of it. At least a turbo is really somewhat of a no sacrifice power adder. And if I am going to put all the money and effort into it just to get the power I would from a mild v8. And like was said, efi and theres some milage.