You may want to have the block looked at by a specialist as new rings may not be worthwhile if there is a lot of wear or scoring to it. Head gasket definitely do whilst its off. The VR6 doesn't have a cambelt. It uses timing chains and tensioners, all of which are worth replacing if they haven't been already. Other things to consider would be; Clutch+new mounting hardwareCrank end oil sealThermostat, thermostat housing, 'crack' pipe and all associated seals and fixingsPossibly oil cooler+hoses, definitely the oil cooler seals Probably worth giving the cylinder head a refresh with new valv