Here is what I 've done I cut the holes on the cover to BBC holes on the engine bay side It looks good ,It looks like you can install the heat core the an hold down clips don't seam to line up right? will the same box work?from sbc heater core ? the clip side of the hold down clip interferes with tubes an the clip with 2 screws does'nt fit to lie flush with the edge of the box the mounts to inner firewall.Do I need to need to change to different box ,Do Tech guys know what i can do to adress this with out buying another box? THZX Joe

69 L88 427 Ralley green 12 bolt 411 posi M22 4spd.