i did that back in the 90's on a stock 78 w72 400, with headers. The t2 intake killed all the low end torque... Made the car noticably slower. later went with a performer and all the torque came back. I'd stick with the stock manifold unless you gotta have aluminum. then I'd go with the performer... fwiw
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports,
3" pypes, Hooker 1 3/4" headers, hydraulic roller,
10" Continental, 3.42 gears
11.5 @117.5mph 3900lbs 
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