i would do the sr--my friend daniel has the sr in his 89 fastback--he did redtop w/ greddy fmic and piping+bov---and 2.5" exhaust and on bald dryroted tires ran a 13.7--its stock except that list---the sr is a very expensive swap to do because of the wiring and fab work,, he spent 7,000 on the swap and labor and parts--so if cost is a prob do the teg