1966 273 Commando - Thoughts

If he is putting a 273 in a 67 the 273 / 318 mounts should bolt on and in, no modification needed am I missing something?
The block in my 67 was an early one (pre 67). I don't know anything about 66 mounts.

Before
2018-05-06_011.jpg

With mount (67)
2018-05-06_017.jpg


Alan