Welcome to the site. For engine mounts, I used plates and my existing mounts. I found them on E bay. Around $35 or $40 bucks. Be sure to get the 1" setback plates so your trans will line up with your cross member.
Here's a link that may answer some trans questions. Check it out:
http://www.hotrodlane.cc/PDFFILES/Lisa%20Tahoe.pdf
Little by little, your info will come and I'm sure you'll have questions along the way as all of us have had.
'93 Chevy 1500 4X4 ECLB with a '99 Silverado LQ4 6.0 and '99 Escalade 4L60E. SOLD IT!!
New toy: 2001 2500 HD 4X4 Extended Cab Long Bed
John