bought a 90RS.was told it had a truck 350 in it that had oil pressure trouble.I pulled the engine out take it apart and start to clean it and find it's a 305.I pulled the ECM and wireing out too.The block has a top hole where the tranny bolts on and a plate over the whole where the machanical fuel pump would have been. I'm wondering if they just jumped TBI heads and intake and keep the original ECM and harness. ECM info as follows.SER.#1228746 86ANTT no.K393030105 inside no. are 379081301059303 and on the prom.ANTT I think the no. 0820,But I'm afraid to touch it to try and take it out.There was another no. 16127501 , any info would help!