I find that my wood type ranges in height, probably due to wear and age; some are higher than the metal I use and some are lower. I can mix them pretty successfully though with a little care. I don’t mix large, fat faces of wood with tiny metal, but if you have some 8- or 10-line wood type it’s not so bad. Regardless of the press I’m on, I usually lock in bearers on either side of the forme to insure equal inking. Then I generally end up building up the wood type a bit. I do it by putting pieces of packing tape on the bottom side of just the letters that need a bit of uumph. Or, if you’re on a Vandy, you can just put super thin pieces of paper underneath them on the press.It’s also good to remember there’s a compromise in inking. I usually shoot to have the metal type print and ink as perfectly as possible, which often means that the wood type is a little underinked. I think this is fine because you’ll get a bit more of the character of the wood type, and the metal type will pull the weight for you in terms of readability. I think you get better results combining them when printing on a Vandy, though a C&P is definitely possible (if you’re using a smaller amount of wood type).Happy to help if you have any more questions- we’re doing a lot of mixing these days!