If you have a actual "Ernie Elliott" Nascar style motor it should be a Windsor style not a Cleavland style block. It should have Cleavland heads BUT the distributor will be in a different location. The intake should not have a provision for a thermostat and most Elliott/ Roush/ Yates motors have water inlet directly to each cylinder head. If you have all of that it will be harder to install a thermostat BUT not impossible. They make inline thermostats and such because they tend to use them and or restrictors when qualifying the motors back then. It should have a single plain spider type intake. Most of these motors were dry sumped too and didn't have provisions for external oiling (
oil filter). You really need to post some pics other wise it a shot in the dark. By the way, having the "
oil injected valve covers" doesn't necessarily mean you have one of his motors.
You can bolt those onto any Cleavland style head and boom you've got the look! Get some pics, I'm curious! Matt