I have an 81 seville, this thing ran great til i started getting a loud metal smacking noise from the motor, and now it just seems like it needs to be replaced, right now there is the V8-6-4 motor in it , the 864 portion actualy works too, this got great gas milage when it actualy ran, but now i need a new motor, i personaly dont really care what goes in but i have NO clue what can go in, its fwd.. would a reg. 350 fit, what motors can i put in that will still maintain the trans. to work correctly... if anyone has any thoughts i would sure like to hear them , searching didnt bring much up for me...

thanks,