from 
http://www.camaros.org/drivetrain.sh...missionNumbers
        tymdds
 where:
   t  = transmission type
   
      MANUAL                         AUTOMATIC
 S = Saginaw 3-speed           A = 68/69 L6 Torque-Drive 
 K = McKinnon 3-speed          C = Cleveland Powerglide
 H = 69 Muncie HD 3-speed      T = Toledo Powerglide
 R = 4-speed Saginaw           B = Cleveland TH350
 P = 4-speed Muncie            X = Cleveland TH350
                               Y = Toledo TH350
   y  = model year (not calendar year)
   m  = month 
        Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
        --- --- --- --- --- --- --- --- --- --- --- ---
         A   B   C   D   E   H   K   M   P   R   S   T
   dd = day of month
   s  = suffix
       PowerGlide and TH350 (not used on all):
          D = day shift
          N = night shift
       1969 Muncie 3-speed
          B = 2.42 first gear ratio
       1969 Muncie 4 speed only:
          A = M20
          B = M21     Use of the Muncie type suffix
          C = M22     began with 21 Oct 68 production.
          
   Examples:
     R7S21  Saginaw 4-speed, Nov 21, 1966
     P8R01  Muncie M2x 4-speed, Oct 01, 1967
     P9T11B Muncie M21 4-speed, Dec 11, 1968
     C9D14N PowerGlide M35 2-speed auto,
            Apr 14, 1969, night shift
yours is P7H14
P = 4-speed Muncie
7 = 1967 MODEL year vehicle
H = June
14 = day, June 14
the 7A vin = 1967 Atlanta, Georgia built vehicle