Can an echocardiogram or a chest cray see if there are any blocked arteries?

No : Unfortunately not. An invasive or noninvasive coronary angiogram would show this.

An echocardiogram..?: A chest x-ray cannot by any means detect this. A rapid 32/inch ct scan can, but quite expensive and not covered by many plans. A conventional exk can find evidence for prior heart damage including an mi, but will not address current blockage. However, a stress test (ekg based), with an individual walking on a treadmill can document coronary ischemia by looking at st-segment depression.