I'm in the process of swapping mine. I should actually do the R&R over the weekend. So far, all I can say is that getting the motor out of the back of my Aerostar was a breeze. I did it myself!
Seriously, I'll fill you in on the details next week; hopefully I will get it out and in. It looks pretty straightforward. BTW I'm putting a used motor in my car... for now. This is my first bonneville, so if I'm totally in love by the time the used motor craps out, perhaps I'll go with the rebuilt or even new. I priced a new Pontiac motor at my dealership for $2600. 3 yrs/ 50,000 mile warranty, even if you DIY.
I decided to DIY because of the following:
1) Heard on the forum it was a straightforward job, not taking forever to do.
2) My mechanic quoted $2400.00 for a used-engine swap... including motor and all the belts, plugs, hoses, and gold ingots
required to do the job right... and no guarantee if it didn't crank over when he was done. Other local shops were similarly OVERpriced.
3) I want to see if I still have the 'right stuff' for the job.