Soffit vents and rafter baffles in finished attic
Those baffles can't &quot;do their thing&quot; if you close one end. You need a complete ventilation circuit between the soffit and the ridge to prevent extreme temperatures on your roof deck and heat migrating into your living space, followed by ice dams in winter.
You need to maintain ventilation against the roof sheathing the entire way up, otherwise you'll build what's known as a &quot;hot roof&quot;. That has significant drawbacks and implications for energy efficiency and moisture management. Here's what it'll look like:

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Be sure you have a good understanding of why this is important and how to accomplish it before you proceed.