You can read my whole build in my build thread here. I have a huge amount of room around the pan and crossmember area.Did you get the 302-2 variant? If so take some pictures if you can. I tried the "white box" from amazon and it would not fit at all, the pan was too wide and hit the cross-memeber with my Holley Mounts. The 302-2 "white box" from Holley.com fit perfect and it matched up to my buddies 302-2 exactly without the Holley on the bottom.
FYI Super Shops is owned by Holley that is why the shipping comes in the Holley boxes.