really need help

I really need help with this one, Im mounting a 454 on my 1970 chevelle. This car used to have a 6 cilinder on it.
I´ve already mount the engine and transmission but Im having a lot of trouble with the steering and the brake booster.
The car has hooker competion headers and the steering wont turn because of the headers position.
The brake booster wont fit because of the valve covers.
The headers just barely fit with the lower suspension........
Any ideas?

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You need to use a different motor mount. Your car has the taller horns for the six cyl. motor mounts. Performance Suspension in Phoenix has the short mounts that will drop it down enough to get everything right.