Points noted about dimensions and trans tunnel. I too would be reluctant to bash or resize the trans tunnel in any way, and there's got to be enough room for the linkage and pipes. I found a site that gave specs for modifying the crossmember and shortening the prop if fitting a 518/46rh. But like you, a smaller trans appeals. Dont want to cause heart attacks anywhere but I know a GM TH200-4R has a good gear spread, is relatively small & light, has a mounting point close to the 727's and should be relatively findable and affordable vs Mopar stuff. Also are rebuildable to take big power. Not that I'll need that, but it'll need to handle big-block torque. At this stage I'm just not sure what to do.
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