Trunk Mounted Battery, Location?

oh my..... gave me goose bumps. I am putting together a 67 dart as a 273 4 barrel car. The best estimate I can find is that a 273 would have run I/SA, or H/MP. This started out as a GT restoration, but because the guy that sold me car kept all of the high dollar trim pieces (fender mounted turn signals, rocker panel mouldings, trunk filler panel etc etc, I decided to turn it into an "old school" street/drag car. It now has a dana 60, hemi style hood scoop, eventually a trunk mounted battery,and roll cage etc. I love these old style Darts