I am pretty sure Med Schools in Texas( and maybe all of the US allopathic schools, though there might be a exceptions that I am not aware of) do not accept lump sum credits like you mentioned. Just call em up like you mentioned they are pretty nice over the phone.
Also, I would recommend against sending AMCAS any foreign transcripts because they wont know the first thing about them and may just end up confusing them. Make sure to mark the box for "transcript not required" or whatever they have for your school from India because if you dont they would just sit on your completed AMCAS which might delay processing of your application.
On a side note, You know what your qualifications are, just fill out the AMCAS precisely the way they want you to and if you have strong feelings about your academic record that AMCAS cant include just get in touch with the schools you are interested in and find out how they want you to proceed. Just remember that AMCAS is just an application service and they just put you in the queue, what really determines your fate is you and the med school you are applying to.