What cam should I get?

Makes sense, this way you know you have the right springs. Hey if you can find out the max. lift without shorting the valve guilds. I look again at hughes site, they claim ALL 318 & 360 motors are max. .450. I tell you right now thats wrong, how much is max IDK but its more than .450. Maybe more than .500 cause many mag. storys have ran over the years and none ever said that the guilds need to be shorten. Thats racing stuff, like for those .570-.600 cams. Those cams to me have too much lift for the short openings, can't believe they last a long time. Good luck and keep us posted.