My bad...didn't know what year car you were working on. However, I have read here on FABO that my manifold sets will work on the early As with P/S. I've been looking for a volunteer to give it a try if they would post the results here on FABO. I even offered a discount on my manifolds and offered to pay for part of the shipping. I've been running the thread looking for a volunteer here:
http://www.forabodiesonly.com/mopar/showthread.php?t=301859&highlight=treblig
Haven't had any takers. But you're extremely close to Corpus compared to everyone else on FABO. If you read all the posts in my thread you'll find quotes from othes who have actually done it. I don't have an early A or I would have tried it myself. If you lived closer I would just lend them to you so you could try them yourself!!! IT WOULD BE GREAT!!!
treblig