will a LS7 90 mm TB fit on a LS3 intake and if it will is a $180.00 to much ? The LS7 has cable

 

The LS3 and LS7 used the same throttle body.

LS2/LS7/LS3 throttle bodies up to 2008 were the same part number.

LS3/LS7 throttle bodies from 2009 and on are a different part number. They are most easily identified by the gold throttle blade. They can only be matched with ECMs from 2009 and newer.