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it really depends on what type of setup you are going for? Is this car a daily or are you planning on making it a track car? That will depend on what type of rear and setup you go with. And IMHO its a no brainer to put ARP head studs, side bolts, cam bolts, and crank bolt. Why build a motor with that type of money and skimp out on $400?
My rear consits of Moser 31's, Eaton Detroit Tru Trac, 3.73s, Trickflow girdle and I love it. Its not the best for cornering however, which is why I asked what your plans with the car were.
Guys tend to really like going with the track lock with carbon clutches as sn95 331 stated