If it had a Chevy V-8 then the 400 will drop right in using the existing mounts and brackets but you might have to swap the lower PS bracket, some of the 267 and 305 brackets won't clear the balancer on the 400. The G-body Malibus and El Caminos were available with 4 speeds and IF you can find the clucth pedals and linkage from one of those they will bolt right in but they are very rare. IIRC someone is now making a manual trans conversion kit for the '78-'88 G bodies. Check the ads in Super Chevy and Chevy High Performance and do a Google search.lygerzeroX said:i have a 400 sbc i'm gonna put in my g body monte is there any mounts,firewall,or any other mods i need to do? and has any body put a muncie 4 speed in a g body monte?