I've searched and found conflicting info about using an earlier intake manifold vs a turbo manifold for my turbo engine build. I have an F54 block, P90 head and will use forged pistons, hybrid turbo, wastegate, boost controller, new engine mgmt system, etc., with target specs of 300 RWHP. The earlier intake manifolds had a lot less junk on them and will be easier to clean up. Which is best for my application? Thanks for your input..mayolives

Are easier to clean up, none the better or worse for flow. With the modest 300hp you are looking for either would be fine. Its when you get to 400 that you are looking for custom manifolds.