Swapping '69 273 with '84 318 Into My 1969 Dart

You need to know what pistons are in the 318. A truck 318 unless modded will not have pistons that come outta the hole.
Pistons play a major role in comp ratio. Any guess is just a guess.

CudaRay said

I'm going off of information I can find with research. What should those numbers look like in reality then?

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