This is one flavor of a GM TBI intake for 5.7, there are various intakes and versions of 5.7. So anyway there is a threaded boss just above the thermostat housing on the front of this intake setup for coolant hose fitting or plug (front is to the far left in this picture). and while its hard to see there is another threaded boss at the far rear of the intake just above the distributor hole in this picture which is also setup for a heater hose fitting or plug or some versions use a heater control valve.
go here and use the "zoom" feature on the pics for close up view
https://www.amazon.com/Edelbrock-3704-Performer-T-B-I-Manifold/dp/B00062YAT4
likely will involve some custom setup...but thats easy....need to see top of intake without the air filter and good view of water pump top to make further recommendations.
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