EFII - V8 ti fill a 6cyl engine bay conversion.

With my '96 EFII wagon reaching a decision making milestone for me -"shall she stay or shall she go" and with the thought of this good and faithful servant being gone from my life being a daunting prospect, I thought that perhaps a repower might make sense. Any way I cut this thing there will be a big cheque book involved and there's know way around that. Sooo, if the old 4ltr six is coming out, I thought a Ford V8 of medium mileage from around the same period as the car - the 1990's, might be an interesting change. The question is: will a V8 motor from say an EF Fairmont/Fairlane bolt straight up to the trans already in my car or did the V8 powered cars have a different transmission from the six's?
Cheers, Bruce.
Cheers, Bruce.