No...I use the motor mounts ERA sent me. They had the extra bolt in as shown here:
http://www.erareplicas.com/427man/en...tmod/index.htm
When I dropped the motor in, the motor mount bolts slide into the perches on either side. Once the engine was in the car and level, I fabricated a square metal piece (with a hole for the motor mount bolt) and place in on the inside of the perch itself to keep things from moving around a bit. I think it will work, but again, my car is not on the road yet.
Make sense?