Doug's headers and mini-starters
You can take that adapter off the top of the solenoid and bolt your wire straight up there if the starter you got is like all that I've seen.
I'm sorry that I steered you wrong and got your hopes up on the Hemi starter. It ain't gonna fit my 273 either, because my block has that same curve in the casting, so it's a no-go with a 10.5 inch bellhousing or a 904. I do believe that starter would work with a small block 727 though. The starter location on a small block 727 is lower than a 904 or straight drive bellhousing. I'd say that's where the difference lies.