Oops. I earlier posted this in Mustang II forum. Sorry about that. But here's my request: My '89 LX hatchback has a dart block 347 stroker with Twisted Wedge heads, F303 cam, 36 lb. injectors, and 70 mm mass air meter. It has AOD with 3.73 : 1 rear gears. I drive it to and from the track, 140 total mile trip in addition to runs down the strip. The car ran low 13's in the quarter mile this summer with stock manifold. Guys at the track said get an aftermarket intake manifold. I want to keep heat and A/C. Which intake manifold do you recommend I purchase? I'm presently looking at Holley and Twisted Wedge. Thanks in advance for your input.