New to s13 240's

[Ehinger]

ok so i just got my first s13 notch back shell. ive wanted one for quite a while and things just happen to fall into place for me to pic up one of the cleanest shell's ive ever seen. the body is fully in tact other then having the blown motor and trans removed. the car its self only has 58k original miles on it. the guy apparently hooked up nitrous and blew the motor and just had it sitting in a barn since then. Now that this is finally in my possession ive been running through all my possibilities with it. first and foremost im not one of those guys who cars about looks over performance, i work at a body shop so i can fix it up to look good later, as of right now im exploring my options as to what motor i should use. the obvious is the sr20 that ive seen used for years now, but ive also began research into the RB's and a few friends have told me to check out the CA's and KA's. ive began looking into them and im just not sure what the big difference is between all the motors? i do plan to drift the car but its also going to be a DD so im not up for welding the diff. so if anyone can shed some insight onto what motor would be a good choice or if someone simply wants to shed some light onto the difference in the motors them selves it would be much appreciated. Kyle