As an alternative I have used St Louis Spring Co. as a source for replacement leaf springs. Good people to work with. Can usually supply your spring and spring hardware needs. Have a pair on my Hurst 300 w/ no problems...
Carter AVS is the way to go. Rebuilding yours can be done by @woodruff carburetors. Another option is the Edelbrock 1406 w/ the carb linkage adapter. 600 cfm is all you need for a stock 440.
Excellent Tim, All the hard work you put in is finally paying off. You may want to expand on the driveway at the entry overhead door. entry and exiting cars at the overhead door beats down the grass. That becomes dirt= mud when it rains. I saw that many times looking at MS listings while house...
The preferred Hayden fan clutch I use is the HD fan clutch for the 440 w/ A/C equipped cars. Always use w/ a fan shroud to get maximum cooling. The HD clutch is simply more responsive in in higher oper temps.