A set of metric taps will be needed to do this correctly....
Each and every threaded hole should have the proper tap run into it and then be sprayed with something to clean it out.... I used PBBlaster... BrakeKleen.. etc... always have goggles on when doing these things....
This is because torque readings are based on the friction a bolt encounters as it enters the hole... and is only mildly coresponding the pull down effect on the item you are bolting up.... so you must have a Non burr hole and it be clean and lightly lubed to get close to what the engineers wanted the gaskets to be compressed to, the trans held on by , etc...
Same with the bolts... wire brush, clean, lightly lube....
This is a messy boring time consuming job.... and worth every effort you can muster to know that your torque readings are accurate when you get finished.
On cars this old and reliable...I use antisieze compound as the lube... if there is a next time to taking the item off you will really be pleased you thought ahead on this issue....