So you were originally using motor mount inserts on the factory motor mounts correct ? If the factory mounts have gone out I'd say replace them. If not usually blown mounts will still cause some sort of vibration.
I guess you haven't heard of VVTL-i It's toyota's version of Lift
http://www.youtube.com/watch?v=ws12Lw2WFLs
http://www.youtube.com/watch?v=0fSOOmaNfjE
also a 1.8 developed to take out the b-series. so honda whipped out the k-series
Wouldn't that k24 be only 5 spd? It'd have a different bell housing to the k20a3. so the transmission won't fit. According to what I read that engine is rated at 160hp