Im tossing ideas for a S13 240 i can get cheap.

what US spec motor or hybrid could i pull from cofers that would be resonable in cost. NOT a KA.
the fall back plan is just drop in a Twincam KA and call it a day.

how hard is a US spec CA to find or a us spec SR and what would it take to put it in a S13. are these bolt in?

also what combination of parts would yeald a good light balanced revvy motor, for an autoX setup? this would ramanin non turbo so high compression and all out power is not really an issue.
a good powerband would be nice.

Im gunna call this my entry into playing with nissons. this is a first for me.