I have a 89 DX and I want to go faster

I don't want to spend much money

What am I gonna do?
Most of you, I'm sure, are going to tell me to go ZC. But I am extremely tight on money. I just put my tokico shocks and GC coilovers on and put a new clutch in. I owe about $370 and people owe me about $400. I need a plan for this summer. I am really liking the D16Z6 idea, the SOHC VTEC d16 out of delsols and stuff. I should be able to find one in a junkyard in the area and maybe rebuild it (any ideas what cost would be, $500 for motor and rebuild?), whereas a ZC, I can't really ($600 shipped, little more?).
I don't want to go with a b series because I'm looking for a cheap swap.
What parts are needed to go from a DX tranny to Si tranny or the other trannies? nothing? axles?
Does a D16Z6 look a lot like a DX D15 (I've seen a couple, but my memory is not very good)? Was thinking sleeper even under the hood

Will headers convert from one to other?
Also was thinking staying with D15 til next year or so when my financial situation is better (which is probably what will happen, but I'm just figuring out a plan)