Here's the deal, I'm buying a 91 HF, I have a 95 z6 head, as well as 2 possible d15b2 donor blocks. Is the Mini-me really as simple as put the head on? I thought it would be easier to find a how-to on this, but not so much. Also I'm doing this for MPGs, what will give me better results, b6 block, or b2? Also anyone have any luck increasing mpgs with low boost levels, like under 6 psi? thanks for any help