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breaking into the 13's bone stock should be cake. Stock gearing, long tubes and a mid pipe i went 13.69 at 103. I see high 13's very possible from a bone stock GT. I was shifting right at 6k.
Well, being that your track is 150 feet longer than it should be I'll guess mid 14's at best! Are you sure its really 1470 ft, it should be 1320 if its a 1/4 mile.
4.0L OHV aluminum block 207hp.
high flow intake , +15hp
platinum sparkplugs wt all high quality wire
, hydrogen injection system ,+25 to 30 hp
5speed trans wt planetarium end for cardan + 35hp
aluminum cardan - 50lb
bolted rear end 3.73 gears
17" aluminum rims wt 17/12 tires on back
15" aluminum rims front
and a lot of weight reduction