Sounds like you got bogus info?
" There are two sizes of bolt patterns for torq convertors."
As you found out,there is another pattern?

Using a 153 tooth flexplate does not matter,it will spin the engine faster while cranking.

You can get a smaller flexplate (153 tooth)
Example:
http://cgi.ebay.com/ebaymotors/Pioneer-A...sQ5fAccessories
Drill holes for the dowels.

What torque converter do you have?
What is the stall speed,won't need much for a 292.



MBHD

12 port SDS EFI