Will a 76 v8 k-member work on my 66?

I will address the only thing left out from the posts above. If you are trying to switch the K-frames for the buscuit style motor mounts you are out of luck. There is no swap available for this if that is your plan. If you are going V8, the above posts are right on!!! Geof

normal pre biscuit style mounts are fine, if you have more power and don't want to break the mounts go with an aftermarket set