Not Ranked
Some rambling thoughts...
Why are you going to replace the flywheel? You can buy a new ring gear for about $30 at almost any auto parts store. All FE are 184 tooth ring gears. Tell the auto parts store it is for a 1968 390 Mustang. You do not have a pitch problem. You have to pay big money to get ring gears of a different pitch.
Can you post a picture of the old ring gear? With a picture I bet someone can identify the problem. Without a picture I bet your starter is not engaging into the ring gear deep enough. I have lost count of all the starters we have had to trim on the lathe. This is just not a Tilton problem.
Did your engine buck when you tried starting it? If not, your problem is probably not the initial advance timing. I suspect the Accel EFI system has a start retard function that you might not see at idle...
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