Unsure which new Carb to pick

Perhaps I'll do that. Which would be the max CFM recommended for an otherwise stock 225 slant?

Also, in your second link, the part where you go " if you don't feel like doing all the adaptation work yourself, check with this guy." is a dead link, it just goes to ebay's front page.

To be honest I'm on the line with whether to upgrade other areas like cylinder heads and such as well, but I've never done work inside a the engine, so I don't know how long that sort of work would take. But if I did do stuff like that, how would it affect the above?