Help Identifying Engine

[malebean16]

I bought a '70 C-10 a few weeks ago and I am trying to identify the engine so that I can buy the appropriate replacement parts.

Casting: 3970014
Date: B23 76

Vin Code: 16R476200
1=Chevy 6=1976 R=Arlington, TX

Engine ID Code: T0302CMJ
T=Tonawanda, NY 03=March 02=2nd Day CMJ=?

From internet searching, my best guess is that it is from a 1976 full size car 350. If I buy parts for a Caprice or Impala will I be okay? Anyone know what kinds of cars were being built in Arlington during '76?