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Longer rods help with the forces that are imparted when the rod is at an extreme angle. With a longer stroke you of course end up with shorter rods. The go to longer rods you need to stretch the motor. I saw this done once to the extent where the cooling shroud had to be chopped and stretched.
Do not forget the valve train.
There are different ways to get to 700hp RPM's is one. More boost is another. A bigger motor is yet another.
The challenge with going with RPM's is the centrifugal forces encountered and making a motor that is still drivable in the low to higher range. Being efficient up high so one can make the HP the cam timing has to be such that you will probably lose drivability. You also they would benefit from redoing your gears to match.
More boost is a possibility as some are making that kind of HP. The challenges now being managing the heat and detonation.
The third option of making a bigger motor (3.9?) is low to midrange drivabity is retained and it makes most existing gear sets even more usable.
You already have the plumbing in place for a 3.6 based long block. It would not be that hard to sell off you long block and start with a 3.6 block. Check on the Nickie's cylinders as I think they can build you a set that could take you there. It would probably be less expensive and have less challenges in the way from achieving your goals.
I find a broad band motor with the right gears to be more usable on the track, in the real world and faster overall.
Just a thought.
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