Should I make the swap to G3?

ch1ll said

You failed to say what year and model car you have and if it has any value numbers matching etc. You also did not say what your expectations are. What will you gain, less weight? More power? Personally if I was swapping to a G3, it would be one of the larger displacement engines, not the 5.7.
As for the k frame, that does seem rip but if these new swaps are the new trend, I would expect it to add value to that year k frame. I would make sure that k frame was pristine for that price, original paint, no rust pitting and no dents in the bottom.

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Don't take this the wrong way, but the whole numbers/value thing doesn't mean anything to me. If it was a hemi car and I wanted to put in an LS in it, I would without hesitation, nor would I care what others think. I'm completely aware of number matching crap but they don't matter to me, nor do they apply to this car. This car doesn't have any value to a "collector".

The car is a 70 Duster as seen in my profile picture.

I already own a 5.7. If I was wanting to spend $10K on the swap, I would without a doubt buy a 6.4. I feel like I could do this swap "relatively" cheap since I already own the engine and efi controller.

Some goals: No oil leaks. No matter what I do, I still seem to have a very small oil drip after putting some miles on it. Also, V-belts are a *****, they don't like to stay on when you turn the engine 7000RPM. I recently purchased some serpentine pulleys for the 408- we'll see how that works. This point may become moot if they work. I'll likely add a centrifugal supercharger soon. This will make leaks on the 408 even worse. Lastly, I think the 5.7 will offer similar if not more power than the 408 (even in NA form) after changing to the eagle heads, rods/pistons, and cam.