your playing with fire if you think your going to stuff a big roller cam in it some pistons will not take much lift so then your fly cutting the piston and if you go big cam then your looking at more spring lbs the stamped rockers can take 600 or so look at the nitro carbided rocker arms by elgin .how about putting a roller cam in it with roller rockers ? if they say any thing tell them its a gen 6 bbc and it came stock with a roller cam and you swap it over to solid lifters and roller rockers thats 2 mods