V8 on 73 up k member?

Does any one know how to install a 318/340 on a 73 up k member. Schumacher doesn't make mounts anymore and the ones they did make were for 72 and earlier k member. I don't want to change the k member if I don't have to. Thank you in advance for sharing your knowledge that's what keeps this hobby alive. Car has 73 slant 6 k member in it currently.