1.5 or 3.0 ohm ignition coil with Pertronix conversion

[hawkeyestoob]

I have done a quick search of this forum and did not see an answer to this.
I am looking to add a PerTronix Ignitor 1381A on my 67 Belvedere with a 318 and change out the coil. What is the best coil when doing this? Do I go with the 3 ohm coil and bypass the external ballast resistor or do I use the 1.5 ohm version and keep using the ballast? Are there any compelling reasons to do one over the other or is it just a personal preference?
Thanks

 

[toolmanmike]

@HALIFAXHOPS will know

 

[Darter6]

Usually the Pertronix 1381A you still use the ballast.I would use the 1.5 and have on many cars. The Pertronix II and III you by pass.
The 3 ohm is Pertronix recommended for 4 and 6 cylinder engines.Did a few Slant 6 Pertronix conversions with a 3 ohm without a problem
I have run 3 ohm on V8 Mopar ignitions and by passed the ballast with no ill effects. Even drove the cars cross country.
I am not sure if Pertronix and the 3 ohm V8 would be a problem. Can't see why it would not work.

 

[hawkeyestoob]

Usually the Pertronix 1381A you still use the ballast.I would use the 1.5 and have on many cars. The Pertronix II and III you by pass.
The 3 ohm is Pertronix recommended for 4 and 6 cylinder engines.Did a few Slant 6 Pertronix conversions with a 3 ohm without a problem
I have run 3 ohm on V8 Mopar ignitions and by passed the ballast with no ill effects. Even drove the cars cross country.
I am not sure if Pertronix and the 3 ohm V8 would be a problem. Can't see why it would not work.

Thanks for this.
You have confirmed what I was thinking and I would say that I am leaning towards using the 1.5 ohm version and keeping the ballast to keep everything as stock looking as I can. This is a weekend cruise, not anything that I am looking to get maximum performance out of so reliability and ease of starting are the goals.