The first major thing I did to my Mustang was to yank out the inline six and put in a V8.  I chose to put in a 351 Windsor, that's what they had at the junk yard, so that's what I bought.  Little did I know then, I was going to be rebuilding a monster.  I happened to pick up a 1969 351 Windsor, the best year 351 ever.  Check this Fomoco site out to see the stock specs of my engine.

This is how it looked for 30+ years.

And this is what it looks like after I got my hands on it.
 

    Going from an inline six to a V8 didn't require many part changes.  I needed new motor mount brackets, a different radiator, a V8 style bellhousing (naughty Dave used the C4 that was behind the 6 instead of swapping it out for a V8 C4), throttle pedal, and a very low air cleaner.  The power steering pump, and alternator bolted right onto the existing brackets on the 351.  That was one very good thing about getting the motor from a junk yard, already had all of the brackets.

    The motor fit was tight at first.  I had the wrong kind of headers on the engine when I installed it, full length style.  But now that I have a pair of shortie Headman headers, there is about an inch or two clearance on either side of the engine between the shock towers.  Plenty of room.  Another fitment problem that arose was the air cleaner height.  I fabricated a spacer out of a really thick rubber pipe fitting, about a 1/4 inch thick, and was able to achieve just the right height so that the air cleaner wouldn't hit the hood nor the throttle linkage underneath.

    When I rebuilt the engine, I wanted it to be driveable, comfortably.  With that in mind, I did little to the existing engine.  The only modifications I did to the engine were: bored 0.030", "slightly better than stock" camshaft, stiffer, double spring valve springs, headers, and an Edelbrock carbuerator.  It turned out very nice.

    The car is a blast to drive, in every sense of the word "blast".  It moves very quickly, 0-60mph is slightly above 6 seconds, and my estimated 1/4 mile is about a 14.6 @ 100mph (I have used a desktop dyno to get the 1/4 mile figures, looks pretty accurate).  I have not been brave enough to take it to Sears Point yet to take it down the strip, I am waiting until it looks a little more presentable, that and I get better tires.  According to the desktop dyno, I am losing almost 1.00 second due to my lack of traction, and I believe it!