Since your engine is already not stock, have you considered just buying a universal cable and cutting it to length? I've used cables similar to this on on my 440 Dart and my '73 360 truck and they work great.
I for one DESPISE those finger pricking POS's ( No offense meant to you I would suggest using the existing cable trimming the excess length off and swaging a new end on or use a brrel clamp likely available at you're local hardware store or lawn mower, bicycle shop LINKY
