I have been running the std port victors on my 499 for the past 2 years. For the money they are a great deal; Performance has been as expected and the only drawback is the work required to clear the push rods. I think I spent about 3 hours with a grinder to get them where I needed them. The benefit I do not hear much about, but was really good for me is Header fitment. I am running Hooker 2" headers in a B body and the fitment was better with these heads than stock steel heads. Only 1 place I had to modify and that was done with a small pipe, block of wood and 2lb hammer.

Best performance with the heads noted in my sig...