When the cam sprocket comes off, you'll see the pin that locates the cam into the sprocket... it is keyed so it only fits in one position. And it's a pretty tight fit, at that. Align the cam with the cam tower mark - see photo below - these should nearly match with the crank at TDC. You may want to check chain stretch while you're at it (read this TSB), as the early 1990's 602 engines were known to have bad chains. Mine was way stretched when I bought it.

For the oil galley, no, it's a single plug at the rear of the head casting, externally. It will be the only 5mm hex plug in the rear of the head. The 10 holes are inside the lifter bores... you can't see the 10 holes until you remove the 10 lifters. The holes are maybe 2-3mm diameter or so, one little hole per lifter bore, on the driver's side of the head. These are what feed pressurized oil to the lifters when the engine is running.