I have a set of stock 1966 289 heads that I am in the process of porting. I am gasket matching the intake and exhaust ports, no problem with that. My question is on the exhaust ports inside and on the top there is a hump/bump? Is it beneficial or recommended to grind down this hump? What do you guys think. I thought that I read something about grinding it away but i can't find anything in my reference material to back this up? What do you guys think? Let me know.