Taken from VAP Auto 96-98 Intake Spacer Instructions.
Once all of the bolts are finger tight, torque them down in 3 steps in the order shown in the illustration. (go to http://www.vapauto.com/spacers2.htm
to download instructions and see the illustration)
Ford recommends tightening them down to 53 in/lbs, then 71 in/lbs and then to give them an additional 90-degree turn. You just want the bolts to be tight. You don't need an air gun for this!!! 71 in/lbs is not much, so be careful you don't strip the bolt holes, break the bolt heads off or crack the manifold.
When installed my Windstar intake I bought a small in/lb torque wrench simply because I am that guy that will use any excuse to go buy new tools.