Purple Shaft 280/280 cam

I didn't get your point.
This 318 is brazillian, I don't know if it's exactly the same. The trouble with the rockers is a fact, many people here had the same problem.

The stock 318 here is: 7.5:1 compression, 300 cfm two barrell carb and shitty manifolds.

Mine will be 10:1 compression, 650 double pumper carb, performer rpm intake, headers, the 284 solid cam and roller rockers. Not exactly a stock motor, at least for me.