Chassis 9193 should have an Australian made Cleveland. The Autolite distributors were single point distributors however. And beginning 1979 the Australian engines were painted black, and were equipped with Bosch breakerless distributors.
The OEM carb was a 650 cfm double pumper Holley, list 0-4777. The OEM exhaust was the De Tomaso GTS exhaust, which had tube headers.
Do the heads have a number 2 or number 4 cast into the upper corners? If so those are US heads. If the upper corners are "bare" they are Australian heads. If its a US engine, the block will have a casting date of 1974 or earlier.