holley throttle linkage
I'm not familiar with the 273, as I can't remember, lol. It's been since the mid 1970's since I had one in a car. So I'm not well versed on the particular linkage.
I think you may need this:
http://www.summitracing.com/parts/EDL-1481/
I'm not 100% sure if that will fit on the Holley.
And this: