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To answer some other questions the reason why I am thinking of doing the 318 is because it is different and the org engine to the car. #2 is because it is about 100 lbs lighter than the 400 not to mention a 904 is 35 lbs lighter than a 727 and with less loss. I figure it might be close in performance because of those factors.

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There are reasons to use the 318 but the weight vs. performance compared to a 400 aren't some of them. From a pure performance perspective the extra weight of the 400 and it's 727 pay off in spades. If you want to use the 318 because it's the original engine, because it's cheaper or because it may get better mileage, then by all means; go ahead. If you're thinking it will be close in performance I think you'll be disappointed.
A Hemi is alot heavier than a slant six, but.........


Dave