I recently purchased a 91 GT.  I was looking at Trick Flows engine kit - Twisted wedge heads, upper and lower intake, and cam. Upper hase 75mm opening.  Has anyone used this setup?  Should you use a 75mm thottle and EGR space and what size mass air meter.  

thanks  

Hi
I just finished installing the Trickflow engine kit TFS K514 350-370 package as well as the trick flow pistons. I installed a 70MM throttle body, egr spacer & 75MM mass air, also had to upgrade the  fuel injectors to 24lbs. Set up works very nicely.
One hassle that you can avoid is either buy new headers, as my aftermarket ones after time tend to distort & when threading them onto the aluminum heads it can be a real pain to get all the bolts in without stripping the threads. If you want to keep your current headers you can have the header bolt holes drilled out & metal thread inserts installed. Wish I would have done so in the first place.  

thanks for the reply.  I do have new headers waiting to go onto that setup.