Swapped a '59 261 into my '53 sedan and used the original 53 frame towers. Since I'd been talking about this on here I thought I might as well let everyone who's interested in on the conclusion.
Rather than post it all again here I'll link to it.
This is the link to the whole story in a single thread. Some of you may recognize pics of your stuff I used for reference. I hope this is OK.
http://www.jalopyjournal.com/forum/showthread.php?t=180110
