So i thought i read somewhere that the cams from a jeep cherokee V6 fits my truck, also a V6 and a 99', but is slightly more aggresive. I would like a little more power without raping my gas mileage. I know i know its been posted before but the exaust and K&N helped my mielage a little (like 1-2 MPG, ill take it) so its time to go down

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So is it true and what kind of difference would they make?? Im also open to suggestions for other cam options, just heard this and it seemed like a good idea.
Also heard that putting the intake manifold from the V8 (dont remember what size)with a spacer, also increases power. Is this true??
Thanks
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-99 Dakota Sport V6 3.9
-31 x 10.5 Kumho MT on 15x8 black rock crawers
-Custom cat back exaust w/ high flow cat
-K&N drop in
Coming Soon:
-Headers and downpipe (first half of the exaust

)