if you used a KA tranny you would have to change the bellhousing to an sr20de or sr20det im not even sure if those are the same.

next up you will need to have a custom header made since the engine sits longitudinally so the fwd header wont work. perhaps if u searched some japanese sites you can find some headers for the rwd sr20de (not sure what/if that came in rwd).

IMHO its not worth the time. i would die to have an sr20de (not T) in the 240 stock cuz it would provide alot more potential for all motor but i am making due with the KA24DE as it is and have big plans for mine.

if u want a 2nd car to throw it into find a beater ass b13 sentra (base model would be best cuz its lightest) and throw your sr20 in there with some slick all motor parts gut that focker out and you might have a decent all motor car.

my next project after this car is done is a strictly road race/auto-X car probably an s13 with a KA24DE built to 11:1CR all motor with full suspension gutted sheetmetal dash roll cage etc. (sr20det is the hype now and i could get the money but dont have the time for swap)