Another cam question, different car...

I know I need to check the piston to valve clearance. But before I order my cam, how much lift can I reasonably expect to run - lets say for example the mopar purple shafts. I have been told I should be able to run a 509 without any problem. What about a 557 solid?

69 440 pistons are .024 in the hole and have shallow valve reliefs. Heads are uncut 906 castings, but I was considering cutting them to bump the compression to run the bigger solid. Of course if I cut them, that lessens the clearance and might make it senseless to do...

thanks