[FWDLK] A hemi head question HELP

[Marc Bradley <MPINEAPPLE1967@xxxxxxx>]

Hello all
I was told by the seller that the pair of head I purchased from him are for a 270 dodge they have a casting # of 1554132-3 on both heads. 
and when I get home I got a surprise when I check the 55 dodge parts book and I see 1554131 
so can any one tell me what part # 1554132-3  is for and if they will or will not work on my 270 dodge. 
thank for the help
  

          MARC B 
 1955 DODGE ROYAL LANCER CONVERTIBLE
 1955 DODGE ROYAL HARD TOP