wilco kit for overdrive on a slant six

[67belvedere/225]

I have the chance to buy a wilco kit for 400$ ,so i could bolt on a overdrive gm tranny
does anybody know if i have to modify the body (tunnel) to make it fit
i called wilco and they don't know

 

[mopar 3 B]

Tho chalt not disgrace ones Mopar.

 

[67belvedere/225]

its a hot rod