i am not a big fan of flat lifters cams in big blocks i like rollers here are some numers howards cam 620/635 294/302 236/242 112 lobe sep and 612/612 296/302 236 /242 on 112this is a good cams for a hydraulic roller mechanical roller 645/645 285/285 244/244/ no110 665/679 282/290 248/254 on110