downsizing water pump bypass SB

For the current hose routing, unless I move the upper radiator inlet to the passenger side, the upper hose runs straight past both the heater and bypass connections on the manifold inlet. Here's a couple pics of what I'm working with..
Both manifold fittings are 1/2" pipe, and while I can thread in the bypass fitting into the manifold, it runs into the radiator hose.
The vertical location is so close to the manifold, there's no way to get a 3/4" hose on there. Even with a 5/8", it'll be tight.

So maybe a radiator like this one, with the upper hose already in the right position would help?

http://cgi.ebay.com/ebaymotors/ALUM...r_Truck_Parts_Accessories&hash=item255c3f1153