I believe the only heads that will work on the GT-40P heads, you need to get the FRPP headers, I don't think any others will fit. You may be able to use some Explorer headers, since I believe they came with those heads at one time, but i could be wrong on that.
As for power and how well the explorer intake flow I have no idea. I doubt its much better then the stock 5.0 intake.
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1989 Mustang LX Notch
5.0L, T-5, 1969 351W heads, cut & welded stock plenum, F-303 cam, Mac 1 5/8 full length headers, Cat'd H-pipe, 3.73 gears, Underdrives, SSM lift bars, E-Fan, 3G Alt, Custom Chip, Autometer gauges, Weld Draglite wheels , M/T ET Street Radials
Best 1/4: 13.33@101.53MPH
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