New project 1965 dodge dart Pics

Originally 170 slant six three speed column shift i am going to drop in a small block and change it to a three speed on the floor with a hurst shifter my buddy and they guy who sold me the car was telling me that i don't need to change the cross member or frame to drop a small block in the dart that i have the option on this model is that true? i took some pics of the bay i did noticed it looked a little different View attachment 20150321_130049.jpg

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