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Thanks for the info. I wonder what the stock manifold is. I picked the Performer because of concerns about height and because I'm looking for more low end torque. With all of the cops in this town, high end horsepower doesn't do you much good.
I did a lot of research before I bought a new manifold. I went with the Holley 300-36 (ironically the tallest) because from what I've researched, it's a cloned 70-72 LT-1 manifold.
(my hood is already destined for an upgrade, so height wasn't the determining factor)
Just FYI I used the GM intake which might be higher than the one your using. Also, used a low profile air cleaner. Keep up the good work!
I used the GMPP intake as well, no choice 8 years ago. I sectioned 1.5" out of the air cleaner, used a 4th gen Camaro air filter and a Ford breather element. Seal just touches the hood and the lid has .75" clearance. Good luck with your install.