Alternator installation...

Behind the bracket on my 273 (have same alum w.p.). There are various water pump and crank pulleys that vary with year and whether AC or pwr steering, so who knows what all combinations are out there. The alternator is the easiest to align.

That collar against the head looks like something somebody hillbillied out of an alternator collar. You can get spacers of various lengths at Ace Hardware and even chrome if you want to look purty and can afford it.