Need help on correct linkage.. who makes it

Your engine photo look to be a '67 4bbl setup. Just use that if it will fit and adjust. If not, you will need to find the early 4bbl bell crank assy and make a front rod work......usually by bending and/or changing the length. When you start using aftermarket parts, you need to get all the related conversion parts along with them, or, you run into these fitment issues.