how serious of a rebuild?? check out monstertrans.com for a rebuild kit they have a few options for the turbo 350 thats where im getting the kit for my 700r4.
i would go for a rering kit for the 350 with new bearings rings gaskets etc they are cheap and easy to find.
few examples...
http://www.ebay.com/itm/SBC-Chevy-350-S ... 64&vxp=mtr (rings rod/main bearings, gaskets)
http://www.rockauto.com/catalog/raframecatalog.php <great source of parts i buy from them a lot
a kit for the tranny will be $70 for Overhaul kit includes friction clutch plates, paper gaskets, O rings, lip seals, metal clad seals and sealing rings.
http://monstertrans.com/store/products/ ... ssion.html and $50 for the servo kit
or $375 for a pretty much complete tranny worth of rebuild parts
http://monstertrans.com/store/products/ ... d-Kit.html
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Luvless
1980 Mikado-Sold.
1993 Lexus SC400 my Daily
2004 Yamaha WR250F my new love in life
2016 Toyota Camry my girls ride