you can put them on if you want, but your definately not using the potential of the head. My friend has the 205s on his 347, but hes running a cam with .670" lift on the exhaust side and .640" area on the intake. I mean you are running a large valved head with 205cc intake runners, you need to mate that up with a Vic. Jr. , Super Vic or any of the others mentioned above. 185s would be more realistic i think. I have a 359W im building for my notch, but my cam is also the same one that my friend has that i mentioned above. If you dont have a cam opening up the valves enough and a good high flow intake to match, how can you have that head flow it full capabilities? just wastin your money. And i agree with the guys who posted above......