Good job.
That’s exactly how I did it.
I would be careful before you fully weld on the mounts. Drop the motor In first. Sometimes
The frame isn’t perfectly true.
Okay I am doing the same swap but with a 3B and replacing all of the gaskets takes forever… and do a good job too, when I putt my 3B back together it started leaking all over the place. Take you time it needs to be prefect. I am literally thinking about getting mine machined.