I want to thank you all for this info, it seems odd to me that there's so many variables here but you don't seem to hear it talked about much.
So here's another wrinkle, lets say an A was rebuilt with 3 1/8" stepped head pistons. Would it be better to go with a distributor off a later offset (100-140) with less advance or go for something more stock with more advance? Or is the reason the retarded the timing on the newer models more a function of RPM then cubic inches? I have done this, I'm more curious then anything.
As to why not just put an H4 on it? Well it has one, and I've got problems that seem like ignition. I have a BN with a distributor which was installed as an upgrade kit form IH back in the day (still have the manual). I just like the way the BN runs better (this is before the A had problems). I do a lot of mid throttle putting around, pulling carts and what have you, and the BN just plan run smoother.
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