Be sure to match and intake to heads. Depends on what gaskets you have whether to gasket match or not. Also blend back a good 1/2-3/4". Over the years I've seen a lot of so called gasket matching and is completely pointless. I like to use cardboard for reference btwn intake and heads. Just bolt down and remove. Open and closed chamber is basically what it says. Years ago prior to octane concerns I do believe many heads were closed chamber. Open chamber just came into place to lower compression ratio. There can be benefits to both. There is power to be made or lost with chamber work. You can spend a lot of time and gain nothing if your not familiar with porting heads. Might be worth sending them off to a recommended head porter unless you just plan to do a little polishing and blending.

Look ok on the net for pics of open chamber and closed chamber heads. Closed can come in handy so you don't have to run big domes. All depends on what the build is for. As far as I'm concerned a flat top piston is ideal but I won't go into that however I think most outdated agree for the same reason. The explosion that takes place so to speak is more equal across the piston top and helps eliminating piston rock etc. But im by no means I'm no expert rather just years of experience.

hope I explained that ok in a way that made sense. Lol...

Btw those flow numbers are better than the ones I looked at. I apologize for that. I must have looked at a different eddy head. Might have been sbc? Not sure.