if you go the turbo 2.6 option, you can use the carb bottom end, though its 8:1 flat top pistons (turbo is dished 7:1) and lacking the oil squirters. at stock boost its fine, 15 max on the na bottom end
you can use the NA head as well, however the turbo exhaust valves are stelite if i remember right. Make sure you use a turbo distributor though or the vac advance wont retard the timing.

swap wise, engine harness, ignitor, coil, ecu, fuel pump, MAF, pretty much all you need

since you are a 2.6 you also have the option of 2.3/2.5TD swap though it wont be fast lol