Fair enough,
Unfortunately in Australia we don't have as many options on parts as the usa and next to no magnum stuff at all. I even have to ship intake gaskets from the usa as I can't get them here. It makes it expensive. For example, if I was to ship the EQ heads it will cost me $100 per head plus tax of 10%. So once I get the $1139 plus $200 and convert it to the aussie dollar and ad our tax it's $2061 landed. Not saying the usa parts are expensive, it's just the added shipping that's a pain. But I chose to import a magnum engine so I have to ware it. I just don't see the point in spending my money on a 40 year old aussie la engine but that's just me.
I think you could be right with the hp increase as I remember reading a guy on this for used a cam a tint bit bigger than mine with eq heads and hit the 400hp mark. My cam is fairly small though at
216/224 @ .500