knocturnal123

hi guys, just wonderd if anybody would be able to give me any advice? i had a 95 vr6 and the engine went pop so rather than re-build it i bought a new engine its from a 98 model so i had to swap a few things over, but now its all in i cant get it to start, it keeps turning over but not firing up, ive checked ive got a spark and petrol and i have, so iam abit stuck unless anybody can help me? thanks