I have just bought an ek4, it has a b16a in it but I'm not sure what it's came from, it has 91 pr3-1 stamped on the head, the block code starts with 54***** and it has a s4c gearbox I've tried reading up on google about it but I'm getting mixed information I was hoping someone could help me! Thanks!
b16a jdm block but head might already change to older model. As for gear box go find roundaboart as jesse said or pull out drive shaft and look inside gear box. If no bar inside gearbox its got LSD.