[Jack21]

There are good reasons to use a Cleveland main journal size crank in a Windsor block; and there are equally good reasons not to.

For a race motor, and you're looking for an extra 1/10th, and you're willing to spend an extra $5,000 for it, it may be worthwhile. (Cause that might bring on other arguments, depending on what class you're racing in, "Why are you running a Ford?". So I'll stop right there.

For a Ford street motor in a Cobra, based on a 351W block; you'll get a lot more torque for your buck (or whatever a buck is in Turkey) with a 393, or 408 stroker; the right cam, and the right heads. But since this motor peaks out at 6200 - 6400 RPM. The smaller Cleveland mains don't present a drag problem until you're in the 7,000 - up range. And, with smaller mains, you need a forged crank. Most Windsor cranks are cast and need the extra beef.

Education is a never ending process. The more you learn, the more you realize you don't know. You'll swear you become stupider every day as you pick up a tidbit here and there, and have the "Devine Revelation" from time to time.

For a '67 street Mustang, you want torque and reliability. Build a 393, or 408. You'll be quicker with an automatic trans, but the car will be more fun in the twisties with a 4 or 5 speed.

Sell the NOS, dial the compression in at around 8.5:1, and bolt on a supercharger. Depending on the boost pressure and sophistication of the high pressure side (intercoooling), your engine will think it's had between 4 and 8 extra cylinders added.

If your huffed 393 engine thinks it's a 786 ci (or 816) MONSTAH, you will have few peers provided you learn how to tame it, and don't kill yuourself in it in the process.

So! Where do you want to go from here?