Here are a couple of pictures of my 2.3 Turbo in a '73 wagon.  You might have it slightly easier because the '73 has a odd one year only rack that has a bulbous knob on it.

 As it regards the passenger side (showing in the picture), and the lower front threaded bolt hole in the frame rail; my lower front mount hole (center) is 3/4" down and 1/4" to the rear of that hole. You can faintly see this in the first picture. If you can enlarge it, it may help.  I don't remember grinding other than removing the old mounts. Likely every car is different so my measurement should just be considered ballpark.

 I had my engine in/out 7 times before I was willing to commit. Every car is likely different  and everything it SO tight, probably 3/16" clearance at the rack, oil pan, starter bearing and hood (also 1/4" at the pulley bolt to radiator).

All the best.  Frankly pulling the trigger on the MIG was like saying "I do" at my wedding.

Tom