So about 12.7 is a safe assumption under good conditions and decent driving? I really wish some one could help me make up my mind.

A pulley, cooling and tires are as far as I'd take this car. So in the grand scheme it's not that much more to just do it all?

I'm sorry to sound like a noob but I can't find too many posts about a tune only. Do we conclude that a good tune is safe for the longevity if the motor?