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I like the set-up. Looks like you put a lot of work into it.
If you really want to swap, try to jut go with the K20a2, or swap a a2 head onto the K20a3. Basically the vtec is more performace orientated because in the a2 it's similar to the old school vtec from the b-series powerplants.
I'm pretty sure the K20a3, is based more around economy. The vtec in it is similar to a D-series vtec. There's actually a pretty good article on the K-series engine in the latest issue of Honda Tuning....
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