thanks guys. my engine is pretty tight with low miles, so i really didnt want to do a whole engine swap at this time, but over time i wanted to bump the HP and i thought i heard some were that the d0ve were the good ones to have. how much HP could i exspect from just doing top end work.(heads intake carb ignition ect.)and if im only going that far will i get good results from any 460 head. id prefer to use other heads because i could have the valves done ect. and just swap instead of taking mine off , taking them to the machine shop and wait while my car is torn apart. thanks again guys for the quick responce.