Slant Six Differences?

[WingCharger]

How can I tell the difference between a 170Ci and a 225Ci slant six?? I found a truck with a slant six in it, but how do I tell the difference  etween the different sizes offered?

Was there a difference between the slant sixes in trucks, and cars? Like the slant six from a 1972 truck be the same as one from a 1970 Charger?

[Chryco Psycho]

the ci is stamped into teh block , the head doesn`t cover all of the block deck & the # is stamped there , I think near the front on the spark plug side if I remember right
the truck & car used the same block , but there were a lot of differences between different year engines in the heads & valve train so swapping can be involved