The 2547 receiver's design is pretty good the way the factory sends it out. Receiver performance is a product of how selective it is, to reject off-frequency signals, how sensitive it is to the weakest signals, and how much internal noise it creates even without an antenna.
The ideal compromise between those qualities depends in part on the environment where it's used. If the noise level coming down the antenna is never below a S-2 on the receiver's meter, making it more sensitive only makes the noise louder.
Most mods I have seen or tried raise the receiver's internal noise level, cancelling out any improvement in sensitivity to a weak signal.
I would start at the other end of the proposition, and first decide which characteristic you seek to improve, and how much.
Just changing parts to see what will change is a bit like playing pin-the-tail-on-the-donkey. Then again, if you can measure the before-and-after difference, that's probably worth finding out, just to see what makes a favorable difference, and what works the opposite way.
One accurate measurement is worth a thousand expert opinions.
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