Since you're doing away with the Computer controls, you'll need to buy a Lockup Kit or DIY.
http://www.rowand.net/Shop/Tech/LockupTCCWiring.htm
http://transgoonline.com/products.ph...dcountview=Yes
Pin 87 ??
You can convert the 700R4 to use a Non-Lockup TC. Requires swapping the TCC Apply Valve in the Pump & removing Check Valve and O-ring from Input Shaft + a Non-Lockup TC.
http://transgoonline.com/products.ph...dcountview=Yes
Many 350s & 700R4s use the same Flexplate.