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Hi Guys
My Boss 9 (600) is being put into a Cobra that started out as an FFR MKIII. Modifications complete and planned have changed that to mongrel Cobra, however the important areas for engine fit are still FFR.
The firewall, pass footbox, and steering link require no changes.
The driver footbox is a minor problem. When the Boss 9 was in the chassis for header construction, the standard footbox worked fine - the Boss 9 heads make it easier by pointing the exhaust port more straight down, away from the footbox. The valve covers are another matter. They should fit without footbox modification, or with some minor bending. Unfortunately, for removal, they must swing out at the lower flange, then be lifted off the top. On my car it will mean fabricating a wedge shaped part that will be installed in the footbox at the lower edge of the valve cover. There does not appear to be any obstruction inside the footbox. You may be able to avoid this mod by using hydraulic lifters and getting it right on an engine dyno.
As to hood clearance, the manifold, carb, throttle body, breather or the absence of one will influence what is possible. The Victor-style manifold and a dominator carb, no breather, will be too tall, but a custom scoop could be fabed. Any manifold from a Boss 9 will fit Kaase heads, but some of the originals can be expensive. One option that seems promising is stack injection. Kaase has my TWM manifold for a P51 setup and is looking at casting something similar for the Boss 9. Clearance will depend on port location.
The Boss 9 that made 980 hp is currently torn down for modification. Pistons were ordered based on the first prototype casting - the design evolution continued- valves were moved for flow - and my engine drifted away from the plan. So, new pistons and modified heads - more like the ones he built for his Third Place Engine Masters entry - are on the way.
Hope this helps
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