Need some info

HI guys im new to Nissan, i am a honda guy lol but want to go rear wheel drive, i have driven it before and loved it… So have to leave hondas lol dont like the s2000.

So i want to get a 95 and up 240, and have been looking in to possibilities for diffrent motor swaps, im thinking of clealry an sr20, and i know it bolts rigth up. But will the tranny from the Ka fit the sr?

Also if i do go with an Sr what will be some of the driveline issues i.e weak spots i will have? And if some one could an aprx cost on a sr motor and trans if needed?

p.s. im a mad noob tried searching all this no luck so if u want even just post a link thanks!!!