A friend of mine noticed many years ago that these Offy powered cars sometimes had exhaust on the left side of the car but other times it was on the right side of the car. Back then he had a opportunity to ask AJ Foyt about this. AJ said the heads were symmetrical so they could be mounted either way depending on the type of racing or the desired location of intake and exhaust.. He's long wondered if AJ was just pulling his leg.
What say those at ApexSpeed who know about such things?