Still, it suggests that it's going pretty well.
My times go something like this:
20SER with Exhaust and air filter 16.2s
20SER with B+ head
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20SER with B+ head, lower final drive and weight loss:
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0-60 with same spec 7.3s
Currently its a bit lighter and making a tad more power (throttle sensor set up improved) so it should do 15s dead.
My acceleration calculator says that for me to make a 15.2s 1/4 mile then I should be capable of a 6.9s 0-60. So somewhere around 7s is possible. Bear in mind that I have to do 2 gear changes to get there.