Go with the royal purple synchromax for about 8 bucks a quart. Fidanza is a good choice, get a spec clutch with it for about 600 for the combo. As for diff, do not replace it with a stock diff, go for quaife or torsen LSD for about 600 bucks. No this will not get you into the 14's. And the only downside of the flywheel/ clutch combo is the chatter and roll over noise.