Well I have had my 496 in the slomaro for a few weeks.
Now I have my 9" waiting to be bolted up (being lazy isnt helping this cause)...i know my new rear will be ok with the 503hp....but can my M21 handle some of the abuse?...or do i need to look for something new.
The tranny has just been rebuilt, and i have been told that a Muncie cant really be improved except for better forks and syncros which it already has.
New shaft as well.

Thoughts?