EJ 115 star flight ?

[MojaveJ]

I have a 77 Rajun Cajun with this motor. I think the guy that had it before me put the wrong control on it when he replaced them. It seems too long. Cables all coiled up in the back. When I set it so that the butterflies are WO when it's at full throttle it idles what seems to me like really high. But if I set it so that it idles normal and throttle it it falls flat on its face and even dies sometimes. Any help would be appreciated. If anyone knows where I can get the right control for it that would be great. When it works it runs across the lake like a scalded dog but those times have been few and far between. The boat is 16'
Thanks