New Motor / Transmission Mounts .... Hmmmmm, what to do ?????

I don't know how many of you follow my blog of the rebuilding of a Spencer 42, hull 17.  She's been out of the water for a very long time and I'm doing a complete rebuild.  Since I got her a year or so ago I've contemplated whether or not to change out the original motor mounts, which were glassed in wood.  About  month ago I decided to change them out with solid fiberglass.  One deciding factor was the story that was posted about the Spencer 35 whos engine came loose and thrashed around inside the boat in heavy seas.  I don't know if the mounts came loose from the hull or the bolts broke; the article doesn't say.

I'm currently reading Hal Roth's first book about when he bought Whisper, a Spencer 35, and sailed it around the Pacific Rim.  What an adventure, also, like "After 50,000 Miles, a great sailing textbook.  He's just left Guam and headed for Japan.   .... quoting from page 182 .... " I started the engine to charge the batteries.  The little Diesel was running nicely when suddenly there was a horrendous bang, followed by a crash, and then silence.  I opened the engine-room  compartment and was surprised to find the engine gone.  The flimsy, built-in wooden mounts had fallen to pieces and the unsupported engine had dropped into the bilge.  Once again we were a true sailing ship."

I think I did the right thing changing them out while the boat is out of the water ... high and dry ... before I install my rebuilt Perkins 4-107.  Nine layers of  mat and roving.