I don't know if it was an Arias block and they did not have the Arias hemi heads, just regular Chevy big block wedge heads.

Here is the car with the Chevy big block from 1973.

and a picture from 1974, I don't think this engine is an Arias as it doesn't have the characteristic Arias hemi valve covers, so it looks like they ran a 392 based hemi