Who has 218HR or 270 HR Comp Cams?

[bad68coupe]

does anyone have either one of these cams? what do you think of them? what heads are you using with them?
Also what all is involved with converting a non-roller block to a roller block?

 

[302 coupe]

I've never used either of those cams, but all you need to do to convert to roller lifters is purchase a set of link bar roller lifters. All the major cam companies sell them.