5.7 hemi custom 545 transmission mount question ??

hello all , when making the 545 trans mount and you have the frame rails level and the jack under the tail section , is there a certain degrees the trans should be tilting (front to back )that we are looking for so as to make sure the trans is not pointed upward or do we just go with parallel to the frame ? please let me know what you guys think , thanks ed aka dartman 440