I used to be a b13 sr20de owner myself. Props for having one as well! There are alot of swaps available for the b13,p11 & b14 models. I believe all the Infiniti G20(t) models have the sr20de motor if i'm not mistaken.

Motors you can swap into a b13/b14 & infiniti g20 chassis are..
sr20de 2.0 (they have euro motors as well, low & high compression available)
sr16ve (nissan edition of their vvl(vtec) motor)
sr20ve (neo vvl 2.0; best motor for N/A route)
GtiR (Basically like a sr20deT motor; not 100% sure about this one but I've heard you can hit 13's easily with this once accurately installed)
sr20det (sr20 motor with a t25 turbo kit; bluebird or redtop)

I've got brothers & cousins who all own b13's/g20's..
One of them is on here..his sn is Wunquikser; he does all the installs himself; he'll tell you what you'll need. Hope I helped you out.