I'd got an intake similar to what you want to do.
I have the stock upper which has been cut and shortened and welded back together. Works great.
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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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