Red: Swap to Roxy's Top End

Swapped Red over to Roxy's top end to eliminate that as the cause of the low throttle stumble.

Specifics of what went onto Red:

• Roxy cylinder head
• The thicker DRATV copper gasket
• Roxy head cover
• Roxy camshaft
• kept RED's base plate
• Roxy camshaft pin and bolt
• Roxy advance
• kept RED's points cover