The coolant going to the manifold needs to come from the cylinder head before it gets to the thermostat. Either drill and tap the head for a fitting somewhere near the thermostat housing or fabricate an aluminum spacer plate to space the stat housing forward about 3/4" and take the coolant from there. The return line needs to go into the top of the water pump, same as the heater hose return. Not a good choice, but it's the best option of a bunch of poor ones.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!