I went the Art Morrison weld in front subframe route. I would highly recommend it. They work with and figure out all of your requirements and are very flexible in their design. I am building a 68 camaro with a full C5 drive line and suspension and I elected to go with their front weld in subframe to solve the steering rack issue and the differences in the suspension geometry. Just give them a call and they will steer you in the right direction! Plus their clips look AMAZING. Below is a link to my project with pics of the subframe.
https://lateral-g.net/forums/showthread.php4?t=21535