You've got 1978 in the thread title, and 1973 in the thread body. Those are totally different cars other than most of the name and the manufacturer. It could probably be made to fit either one, but as @jozsefsz said, the '73 would be a lot easier out of those two.I was wondering if a Chevy 305 engine will fit in a 1973 Mustang?
Sorry about that I typed that wrong.1973's not a II, you might wish to ask in another forum. Though your title states 1978 so I'll assume that. A 305's a few inches wider than a 302 so it would be a very tight squeeze in a II (and finding some very narrow headers may also be a challenge) without more substantial modifications. A 1973 has a substantially wider engine-bay. Then you're into oil-pans, transmission configurations, etc. I'm sure anything can be engineered to fit, but as you're a new member and I know nothing about your background, and you're asking a question best asked by doing a lot of googling and measuring, I'd say no it definitely isn't going to be an easy fit. If you have a 305, sell it and pick up a nice H.O. 302.
The Chevy 307 was just fine. It was a 327 crank stuffed in a 283 block from the factory. A friend in high school had a Chevelle with one.I dunno, from what I remember the 307 was a complete turd compared to the 305?
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