Got My LS motor

ok so i got an ls motor b18a1 actually i got a whole 91 LS minus the front seats for $250 the car has 89,000 miles on it new clutch and timing belt. body is a little messed up but it runs great. the guy lost the title so he sold it as a parts car, im gonna part the rest of it out so i can buy more stuff for the b18 but i have some questions....

1. Money got tight and i had to sell my b series mounts and linkage so i need new ones. are any of those ebay brands even worth buying? there are some that are closed in and some that are open as far as the bolt holes, the open ones seem like a bad idea to me but i want to know if ANY of these no name ones are woth it?

here are some i was looking at:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=50454&item=7982784758&rd=1

These i know are good but does anyone have them? any axle problems or clearance issues?
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=50454&item=7983123737&rd=1

and these cheaper ones that look like they are already rusting
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=50454&item=7981958592&rd=1

2. will i have to change any of the plugs on the harness i have an si with mpfi alredy, will the throttle cable and clutch cable fit also?

THANKS IN ADVANCE ps i used the search first and still wasnt really sure about the plugs