here's an idea for cheap insurance, if yer worried about your motor mounts.
run a piece of chain from the head down to the frame. it aint pretty, but it's effective. my 'stang used to have a problem of rippin motor mounts apart. I got tired of replacing the air cleaner from it hitting the export brace. once it even took my tranny mounts with it!
once it's chained, it'll stay put (relatively speaking). and you can still tell when the mount is FUBAR, cuz when you let off the gas, you can hear the engine come back down.
that's my $.02