quick question before I run off to class which has been on my mind:

how to tell if the m103 block is at TDC? Does it matter which stroke the first piston is on? exhaust vs compression? or is TDC just when the first piston is at the top?

or am i supposed to look at the timing mark on the crankshaft pulley? what do I look for here?

cylinder head is easy enough I think, just the little hole behind cam sprocket has to line up with cast mark on the cylinder head?