440 k frame member

Which k-member do you have now. There were only two available in 1973, /6 and small block. If you have a small block k-member go to www.bigblockdart.com and find the tech pages and read the article on building your own DC (Direct Connection) K-member. Then all you'll need are 74-78 big block spool mounts.

If you have a /6 k-member, it's up to you on whether you want to buy a k-member to modify or just get Schumacher mounts.