I just bought an 86 CJ7 with a Torque Flight 999 automatic tranny mated to the 258 I6.  The tranny works great, but the engine knocks like my grandpa's dentures.  I have a 401 gathering dust in the corner of my garage...

I know the 401 will bolt up, but where do I get the torque converter for the swap?  I've only seen the tf99 mated to the I6 jeeps- even in the FSJs.