custom motor mounts without bushings, will i feel alot of vibration?

I putting a 305/700r4 into a 51 desoto. a friend is going to fab custom motor and trans mounts without bushings. will there be alot of vibration in the cab? and should i take the time and money to add bushings. how big of a difference with or without?

 

unless you are racing , on a street car i would have some sort rubber mount or urethane bushing .you should post your question on the main board , you may get different opinions