Inboard means that the clutch driver is closest to the engine.
Outboard means that the clutch driver is closest to the seat.
Unless you've got a really stiff motor mount (base plate), I'd suggest keeping the engine squarely over the motor mount rails on the frame. The twist/flex at the base of the engine can cause problems (amplified) if the engine hangs too far over the right side motor mount rail.
I prefer the clutch mounted inboard, but it's just as common on sprint chassis to mount them outboard for a series of reasons (seat strut location, frame rail, rear S bar, etc.)
If the chain guard is still hitting the seat, either move the seat enough to clear it (without messing your scale numbers up) or grind/clearance your chain guard (minimally) to clear the seat. Be sure you have adequate protection -- that guard is there for a reason!
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?Thanks and God bless,
Brian Carlson
Carlson Racing Engines
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