City,
You can use the original equipment LS mounts with our trucks if you do a little fabrication. The OE mounts are way more sophisticated in keeping engine vibrations out of the truck than the 1950's vintage mounts most people use. Another plus is that they won't interfere with anything, headers, AC compressor etc. Tom Lamb did it one way, I did it another. Here is the thread for the way I did it.
http://67-72chevytrucks.com/vboard/s...d.php?t=364782
You can re-construct the original type e-brake system on the new cross member if you want. Here is a thread on that.
http://67-72chevytrucks.com/vboard/s...d.php?t=381313
TR