Are the frame rail undersides open (channel) or boxed?
I would consider boxing them if not already, depending on drive line choice.
When they did my Buddies 63 and they went with a full new back half on the frame as we knew that he would work his way upto a AI 2 block soon ;D
Best of luck it looks like a nice clean job.
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When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car. 
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