Out of interest ... Does any one recall the thickness of the factory stabilizer bar ??
Is it 22mm ?? But I think I just made that number up .. Lol
Anyways ... The Windsor is not a too heavy of an engine ( heaps lighter then the boss ) so for everyday spirited driving I think the 27 will be fine.
I went the 30mm as I'm running a 347 and I wanted to push the car hard to see what it could do. And it does just fine