Valve springs and retainers, shims possibly, lash caps are very good to have and hardened pushrods. Be sure to have some cam lub handy too.
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88 347, Twisted wedge heads,Comp Cams 224/230 cam, 1/4=10.718 @ 123.02 mph dyno=
http://www.fbody.com/members/LarryS/mustdyno.jpg