Changing motor mounts with engine in car

Yep. Take the distributor cap off so you don't break it. I used to take the battery out but you can do it with it in. I just like stuff out of my way.

Then take the nuts off the bottom of the mount from underneath. Put a 2x4 under the pan and jack the engine up far enough to clear the K member and unbolt the mounts from the block. Change out the biscuit and reverse the process.

IMHO... I'd use solid steel motor mounts instead of rubber. Rubber fails. And I've never felt vibration from using solid mounts. Just another reason for me to detest the spool mount K member.

Like said, use a solid motor mounts if you have some power and a lead foot.

*For instance , mounts that sag... eat up header clearance to the suspension*