Conversion motor mounts
73+ V8 K member...$75-$100
JY 73-76 V8 mounts $25
New inserts for mounts $20
V8 K for /6 K, swapping over all the pieces 8 hrs. or more.
Schumacher conversion mounts $159+S&H, or less if on sale.
For a difference under $50 and tons less time/labor Schumacher wins. Especially if you dont need to rebuild the rest of the front end.