I have a 5.0 with a Mustang cam, GT40 heads, 70mm Mass air, 65mmTB& spacer, with BBK shorty headers. I have upgraded the stock valve springs with a set of TFS valve springs and am thinking about getting a set of 1.7 Roller Rockers, just not sure if they would be beneficial to my set-up or if I should just wait for better heads. It might be a while before I could get the heads, I plan on a higher stall convertor and built AOD first...........then maybe a different cam. Will I notice a difference with the roller rockers compared to the stock ones?