Most bolts wont need replacing, MK2s arnt that bad yet!
Heres a list I wrote out for my last engine conversion, this covers the actuall engine bits. You might want to overhaul the running gear while you're there, ball joints, track rod ends, bushes etc. Also during an engine conversion is a good time to convert to PAS if you plan to, makes fitting the rack a doddle!
10x head bolts
Head gasket (metal one is preferable, if 2.0 an ABF one, if 1.8 a G60 one)
Inlet manifold gasket
4x zaust manifold gaskets (they come seperate)
8x Copper zaust manifold nuts
Some zust manifold studs depending if any shear/come out with the nuts
Timing belt & tensioner (matched to whatever block you are using)
Solid rubber 16v/G60 rear mount (stronger)
Synta Silver oil & quality oil filter
Clutch kit
Gearbox input shaft seal, push rod bush & seal
Gearbox release bearing & end cap
Recommended bits:
Solid rubber 1.3/16v gearbox & front engine mounts
New alternator/pas etc belts
New metal coolant pipe
Thermostat & seal
Spark plugs, rotor arm & dizzy cap, air & fuel filters etc
Rubber cam cover gasket kit
Plastic coolant flanges that attach to the head
Redline MTL gearbox oil