Post #2 is loaded with good information for you to digest. Based on the information provided, this engine will be getting a flex plate, not a flywheel. So IMO, It really doesn't matter which way you go for balance. (full internal vs weighted flex plate). I prefer an internal balance as that gives you full flexibility for the engine in the future. (future use as a stick shift engine with aftermarket flywheel and so forth). Also, your desire to avoid adding heavy metal to the crankshaft may be flawed. That decision may or may not matter what flex plate you use because weight may need to be added to the front of the crankshaft as well which has no compensation on the front. Since a re-balance is in the plan, have it spun up and see where you land going for an internal balance. Honestly, if a little weight needs to be added, the cost is about the same as messing with a weighted flexplate. Almost every one I have used needed some weight removed or a little more welded on to get the assembly within 3 grams which is our default for a street engine. Hope this helps.
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