I converted my 361 BB auto 65 coronet wagon over to a 4 speed a couple years ago. Used a 10.5" cast iron bellhousing, flywheel,and inpection cover. The cross member is 4 speed only and different from the auto/ 3 speed cross member. However you can modify the auto into a 4 speed.I believe that is what brewers does because they want a core when you buy one. You basically put the rubber mount in the middle of the cross memeber. You will also have to have the rubber 4 speed tranny mount. I used a 68 23 spline 4 speed so that I could stay with my factory drive shaft as 65 auto were slip yoke and 65 4 speed were still bolt on drive shaft. A 66-67 B body speedo cable from napa will work with your 65 cluster and the newer trans speedo gear housing. You will also need the bracket that bolts to the inner fender for the Z bar, a V8 Z bar, and the bellhousing ball stud bracket for what ever year bellhousing you go with, 62-65 clutch fork, clutch pedal pushrod, clutch adjuster rod, 62-65 b-body pedals,floor hump, and what ever shifter box, rods, and handle you go with. I think that is about everything plus your clutch kit and bushings. I may have a few extra pieces if you go to trying to piece it together PM me and I can look if interested. I can also take a few pictures if need be.
Matt