When Chris-Craft introduced the XK-22 someone at the factory thought it would be a good idea to use the 350FLV in a HIGH COMPRESSION configuration of 11.0:1 that was rated at 350 HP @ 5800 RPM according to their specification sheet of the day. Aside from requiring a very high octane fuel, there may have been other issues reported by the dealer's customers so starting with engine serial number 611027 they were installing 9.0:1 compression engines rated at 320 HP @ 5600 RPM.
As for the question of color scheme w the bronze, the red accent striping appears to have been used on 1972 and earlier models. In 1973 and later it appears they switched to using brown accent striping like that on the XK-22 owned by John Bakke who has posted here. Not a big deal but thought you would like to know your boat exterior is original in all likelihood.
As for your interior vinyl, I happened to have taken photos of a beautifully restored and show winning XK-19 at the 2013 Buffalo Launch Club classic boat show near Buffalo, NY. It's interior was brown vinyl like that in my XK-22. Looking up the XK-19 (1970-1974) in the Chris-Craft Essential Guide, under Upholstery they list "White, brown, yellow". As to when these colors were used and available is unknown to me.