That asking price is about double what it should be.
Also, Ford didn't put out a 200cid (3.3L) V6, the closest they ever came would've been the 3.2L DOHC 24v Yamaha-built V6 they used in early-90s Taurus SHOs with automatic transmissions, and it wouldn't easily fit in a Mustang II.
They did put out a 200cid (3.3L) inline-six engine, but it would take some pretty serious modifications to make one fit in a II if it would fit at all (they were pretty long, Mustang II engine bays are not.) Besides that, the 200cid I6 is a pretty big downgrade for power and fuel economy compared the the 2.8L (171cid) V6.
Ask some more questions of the seller, and take and post pictures if at all possible, the more info you can provide us, the better help we can provide.
__________________ 1976 Ford Mustang II Ghia: 302 with a 600cfm Edelbrock carb, Edelbrock Performer 289 intake, Dynomax Blackjack headers, 2.5" exhaust with Flowmaster Super 44s. RJS 11-gallon fuel cell, C4 tranny, chrome 16" pony wheels, fuzzy dice, brown vinyl half-top, and painted in the tackiest color ever (harvest gold, that's why I call it "The Goldenrod").
Also have a 2003 Dodge Ram (lightly modded daily driver/tow rig/office/dining room/home away from home/workshop... I call it "The Big Blue Dawg".) | 
Looking to buy a 1978 Mustang Ghia 
