Hughes 27-30 and B&M 10239 will not line up.

70aarcuda said
in correct statement...someone ordered the wrong parts...

externally balanced converter does not use a externally balanced flexplate..it uses a neutral balance flex plate...

http://www.summitracing.com/parts/bmm-10230/overview/make/plymouth

or MP P4529751AB

I apparently did some uneducated ordering. I am going to order the Mopar P4529751AB. I don`t understand why Hughes does not make a flex plate that will work with their convertor.