427 fe harmonic balancer

[V8Dave]

Hello everyone.
Hoping some knowledgeable fe people can help me with two questions and some views/opinions.
What is the standard outside diameter of a fe crankshaft snout where the balancer slides on to is it  1.375(1inch 3/8)? Which I believe is standard correct?
My next questions is regards to Romac harmonic balancers what are people's thoughts experience with this brand?
Thank you for your time and any help and advice it's much appreciated.
Kind regards
Dave