Ant-
I've got a 4 speed. The bellhousing is a Quarter Master for the reverse mount starter, it's 11 lbs. This link is to the 5.5" clutch package but, they make a 7.25 only it's not on their site.
http://www.quartermasterusa.com/content/product.asp
Yes they make it for the Windsor but, I'm running either a 434 cid iron Dart/Rocket block Chevy SB(640hp/600) or an all aluminum Dart 18* Chevy SB (780hp/690)... sorry
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Scott