My experience is that there's a significant increase in power with the longtubes compared to the short tubes, even at the 325 hp level. For me, the biggest issue with the longtubes has been getting past smog checks, which I usually end up "paying" for.
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'91 LX
Procharger, 3 row intercooler, extrude honed Cobra intake, Mac full Length Headers, 30# inj., 73mm C&L, 75mm tb, E303 cam, 289 rods, ported E7 heads, MSD, T-Rex w/255 lph Walbro, 5 lug conversion, Cobra R wheels, 3.27 gears and Moser Axles.
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