I checked the 7 small blocks in the shop and all have only 1 water pump heater hose fitting and one on the manifold. The edelbrock 2 x 4 would be difficult to use, but that motor is going into a T bucket . the hot side is the intake with the return going into the top of the water pump.. I have had to burp some systems. ;;; slide the top heater hose half way off and drill a small air bleed hole. put the hose all the way back on start the engine and warm it up... loosen the hose, slide it out to uncover the bleed hole and when the air stops and the antifreeze starts coming out slide it back on ...tighten the clamp ...other times I have had to fill the coolant recovery bottle, warm the engine and hope it burps the air out into the bottle, spray cold water on the radiator and it would suck coolant back into the radiator, repeat until it stops burping..