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

You used a -ve number for piston "dome" volume? You're using domed pistons?
Also 0.10 deck clearance?
I guess I'm hoping with the dual-plane intake, 4bbl, headers, and mopar orange ignition module it will at least be equivalent to what the 273 was.

It was running lean when I was driving it, so I may not even notice the difference if the 318 is tuned well. I have no further performance mods in mind after those, it'll just be cosmetics.

The gaskets I got were fel-pro, and I want to say they are 039. I couldn't justify 4x the price for a $500 engine, haha.

-edit-
The calculations I just made with compression show a compression ratio of 8.5:1, which isn't bad. The stock gaskets seem to have been .069, so I imagine that could make a difference? I could be doing something very wrong though, as I've never messed with compression ratios.

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