Staying conventional considering I had a billet intake made for the 632.

Think you hate money more than me. How much was the intake and is it two piece? LOL
Post a picture.

It was only $3,500 has billet runners fabricated top. I just wasn't sure with the hardware I had it would crack 1,000hp on pump gas. I figured it would be close. So, when in doubt spend more money. I know it will crack 1,000 now. Now all my buddies I boat with are getting rid of there fast singles and buying gay center consoles with egg beaters. WTF! That has a lot to do with why the motor hasn't gone together yet. Who am I gonna beat up on now?

LOL I have done that before myself times change. Now its two of everything. I should of kept my old heads and bought some 980 superchargers and bin done. Live and learn

Or use pair of 454 mags put a pair of Borg Warners on top and made 1100hp for no money...

Only trick to doing turbos right is a watercooled manifold. Which is no small task.

Turbo's.

Or send the inconel headers to a place in Florida that does the offshore diesel fishing boats and have them wraped with the ceramic.

Or just do what all the other Marine turbo engine builders do and throw a water blanket over the turbine housing and call it done.

Here's another interesting read on 598cid marine engines from 2016