B1 BS Headed 440 Header Suggestion

I would still try to run the TTI header. That said, could you lower the engine mount down by cutting the mount and drill holes lower down. The problem then is the oil pan is also closer to the road! I think that the headers in my Duster are easily 3/8's of an inch from the floor, and biggest headache I had was putting them in with the T bars.
I have the TTIs and a 440, and once the engine is positioned properly the headers fit with out touching anything, and I didn't have to ding a tube for any clearence issues.