s14 front clip to a auto. left hand drive s14

[lilgeneral22]

im a beginner this is my first build ever n im looking for some clarification so i run into as little problems possible so please bare with me....im about to go buy a s14 front clip with an sr20det from a jdm shop i was under the impression that i could just slip it right in n start it up. someone told me i would have extend the wiring harness from the engine and change the trany harness because it wont plug in to my automatic.. also will the jdm pedals bolt in to my left hand drive s14?

please help

Andrew .MK