Getting ready to swap a 5.7 into my 73 Dart Swinger

Ok been running into an issue how can i get ride hieght correct so that I can measure my 1to3 degrees to the rear? Do I just put blocks and stands and make the vehicle level? I have had so many people say they will help, FABO is the only help I've gotten so far you guys rock! Dying to finish the Fab work on my transmission mounts