the turbo 350 and the powerglide will share a cross member. The 200R4 has the mount farther back but still the same driveshaft length.
The 200R4 and the turbo 400 can use the same crossmember. If you look on the G-force website, part # RCG-400K fits both of those transmissions. You may need to make minor modifications if using a stock 200R4 crossmember for your turbo 400 swap.