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Bob I'm using the stock front end. The engine plate is the same for RB and Hemi but the location is different, like you said. I've got some D452's here, will see how close they come with the motor in the wedge location. I've been told that they will fit, will see.
I'm going to be building 2 different sets of engine plate brackets that will be bolt in. One set for the RB and the other for the hemi. That way if and when a hemi shows up I can go either way.
Thanks for following along and sharing your knowledge Bob!!