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Option Information Group(4)
F - remote mirror
K - 396/375 L78
L - 302 Z28
N - 396/325 HP
P - correct code for SS 350 (Early LOS but not added on NOR SS's until Oct.)
If there was no designation in Group 4, the car was either a 327 V-8 or six-cylinder model.
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Mostly correct, except for one major detail.
4P could be a L30/M20, which is most definitely a 327.
Try
http://www.camaros.org/numbers.shtml#67Codes