ARP makes a head bolt set for the KA24DE,
www.240sx.org has a link to purchase them. I don't think the cam uses bearings, but it could be. The timing chain guide(s) should come with the timing chain kit. I don't think it is necassary to replace the stock/factory crank in your used engine, just use the origanal crank and have it turned and do the works to it.