Rat Layout & Question

[ustompsteve]

I am working on a layout for the ProCo Rat. I was wondering if I would run into a problem using a 4558 type dual op-amp instead of the single op-amp that it came with? Will that work O.K. assuming that I handle the pin-out changes? Does the lack of Offset Null connections cause a problem?

I was thinking this would be better since I have a bunch of dual op-amps.  Any thoughts.

--Steve