Replacing a 273 motor for a 5.9 360 Motor Question

Abodybomber said

Price pretty good.Didn't see what trans you had.Have you done any tuning?(timing ,jetting,all the small things that make it nice).I do not know.But you are asking all of the right questions.

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I have the day off on Monday, going to go over and look it over one more time. I am not sure of what is ment by external ballanced, I have read up on it but not sure if any extra parts will be needed except for a differnet motor mount. I am also going to order a new engine tie down strap from summit. What yea think....