If you plan on dual feeding you NEED the billet forward drum.
www.CKPerformance.com
Scott McClay Transmissions, 200-4R Drum
200-4R Components
http://www.jakesperformance.com/200-...uild_Tech.html
TH200-4R Rebuild - Dynotech Performance - GM High-Tech Performance Magazine
200R4 Rebuild
Here are some links. I have a bunch more that include suppliers that have parts.
I started a project thing on this site and included some pix. I am moving along on my rebuild but my time is limited as is my %. Did you contact David Husek? He is a noted builder full of excellent info.