Crate engine install

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Hey everyone!
I am having trouble finding a shop to install a new crate engine for me.
So, I'm about to just do it myself. Best I can, as long as it takes.
Is there anything you can tell me to be aware of?
I'm looking at getting the GM 350/290 engine.
My truck is a 72 w/ a 350 and a 200R4 in it currently.
I figure I'll remove the grill to avoid wiggling it in and out.
Other than talking a transmission guy into coming over and making sure I set that up correctly, I cannot think of much else.
It's got to be better doing this myself and being able to drive it one day, than looking at it.
I dunno. Any suggestions?

Cracked head in Louisiana