70 dart 6.4 8hp70 for mom

I was hopping not to modify my tunnel either but the 8h70 is a much larger trans than stock tunnels can handle. At least on abodies.
Did you use the Holley cross member upper hoop replacement. I'm taking out the upper factory one it's huge and in the way and trimming the lower part as well. I'm sure I need to cut some ears off transmission they stick way way up. Already seen that done on A body without removing entire tunnel just have to see. Worst case I will cut out existing make it wider and a little taller.