HELP !!! trans id.

[lasher78]

Ok i just bought a motor and trans that i wanted for my 66. The guy told me that it was a 250 inline 6 with a 700r4 trans. but i dont know! Can some one help me? I tried looking up the cast numbers but not finding out much. so here is what i do know.

Cast number on side of case 8663548
Has a "K" on bell houseing
also a MD 8 on side.
Aslo has the arch on side of case through top cooling line

Has a square plug on drivers side toward rear (4 prongs)
On passenager side a cable running up to carb ( was told it was kickdown)
Under tail shaft is a simi circular thing with another 2 prong plug.

When i bought it guy told me it had cable style for speedo. well i cant find it. he said he had it in a 66 this is why i bought it for mine.

Also cast number on side of engine block is 3921968 is this a 250?