I think you should back up and start over?

the geometry works out a lot better if you use a holley carb throttle lever extension and a Chrysler throttle stud. I think you'll need to drill a hole to attach the lost motion link.

demon linkage.jpg

'68 Fury Convertible
'69 300 Convertible
'15 Durango 5.7 Hemi
'16 300 S Hemi