[vector1]

looks like you're intent on what you are doing, so i would pull the heads and look at what you have regarding piston to deck height, eyebrows, etc., you can also alter your head gasket thickness to help with the compression ratio. if you have to cut valve reliefs i wouldn't worry about the rebalance.

you might look into the new competition afr185's as potential heads. with your small bores i'm not so sure you would benefit from all the potential airflow of big valves so i wouldn't get too excited about that aspect. after you pull your heads put some soft springs on a cylinder and check what your current p to v clearance is, this will give you an idea of how far you can go and how much more valve you can use with current pockets if you put some clay in there.

definitely get a cam made specifically for your combination and application. with your rpm you should be able to run hyd roller pretty easily. blykins works with a good cam guy and he can give you an idea on how much lift and duration to expect, then put a degree wheel on your engine and check your duration and lift values against your current setup.

good luck.