compression or flow?

So, if were to put my W2 heads on a 69 340 with stock slugs in them? Would the compression be up to par with a 240-250 duration 550-600 lift cam? Just asking. My 360 is fresh bore. The 340 is very usable.

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I'm curious about this question myself. Personally want to run a solid with those specs; 240ish duration and 550 to 600 lift. I've been told that my 10.1 comp is going to make my car a dog. Thought about pulling the heads and shaving them to get ratio up but if it's not totally necessary....