eghatch4sale

ok i just bought a complete ls droup out from a 95 ls i was looking at it and the head has p-4 stamped on it or something like that the last ls droup out i had the head was stamped p-75......i dunno did i get a obd0 motor????? or am i just imaging that my last one was stamped p-75 i really dont think i am though plus the spark plug wires and some other things say p-30 on them??????? plus another thing i noticed to be different was that the ecu (p75) i got is silver not the goldish color of my last one????? the block is stamped b18b1 so i am kinda counfused if some one can help me out on these specs of this i would really appreciate it thanx in advance!!!!!!!!!!