Doesn't cost anymore for the 60 tooth and its nearly twice the crank angle resolution so may as well use it. Here is a link to the wheel I used, its $60 USD. They make several diameters, so check your balancer OD for the best fit.
https://www.holley.com/products/igni.../parts/556-108
If I had it to do over again, for ignition I would go COP (coil on plug) like the Ford Mod motor guys use. Clean and (I think) a better solution. Individual coils mounted right on the spark plug. Here is a Pontiac with COP ignition, you can see the coils right on the plug.
You can buy COP stuff here:
http://www.granatellimotorsports.com...d-2433-25.html
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1964 Catalina 2+2 4sp, 421 Tri-power
1965 GTO, Roadster Shop chassis, 461, Old Faithful cam, KRE heads 305 CFM,
Holley EFI, DIS ignition.
1969 GTO 467, Edelbrock 325 CFM, Terminator EFI
1969 Firebird Convertible
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