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"I figured on swapping out to a silvertop 20v, that jumps me immediately to 165hp from 120hp."
That figure is grossly overblown. If you are paitient enough to filter through it, read the 20V discussion thread here where a link is posted to a club4ag thread. In it an AE102 Corolla swapped from a 4a-fe to a Silvertop and put down around 100 HP at the wheels on a manual transmission.
If I were you I would stick with your 16V 4a-ge and work on raising the compression with pistons, maybe shave the head a bit, put in some 727 cams or whatever, full exhaust, MSD, I think you could get 120-170 whp with a built 16v. Maybe you could also lose some weight, if you are brave, you could pull the power steering pump, pull the A/C, etc. But that's probably not what your after since you say this is a DD.
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