It's not possible to go 160. Your Speedo will be off 36mph at 160. HAHA just givin you trouble. I don't know how much it would be off espcecially if you banging the 160 mark. What was your RPM in 5th when you let off? I can't remember the math and how to do it but you should be able to take your tire size, along with your tranny gear and diff gearing and figure out your mph. Those speeds are incredable! I bet you had some window whistle. But the lowering springs helps out your aero dynamic. Wish I could have been there to see that!!!!!! I think you have me TOP speed. I think the 3.73 will allow me a top around 147ish at 5500rpm. Corral net has a speed calculator I will have to check that out 
Merlin
281hp 324tq
Timing 14' FP 36,24lbs,190lph,75Maf,65tb,cobra upper&lower,B303, GT-40 Crate with X al heads, Mac shorties, Off Road H,2chamber Flow's dumped, Tokico 5wys, Hotichkis Ctrl Arms, Alum Drive shaft, 3.73, Sub Frame,Steeda Tri-Ax, 94 Seats Drivers side powered.
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