That's fine....but realize- we don't read minds here. Minimal information produces questionable results. I hope you hang around here a long time and become one of the gang of crazies because you probably have things to offer as well.
And sometimes my posts will come off a bit rude- but they really aren't meant to be. ...just very direct. I wish I could be of more help- but I don't have the personal knowledge of the carb swaps- but now that I goaded you into divulging a little more information, I'm sure you will get more help.
Any chance we can get the #'s that come after 0HH60 ?
EDIT: And not to be a wise guy- but maybe clarify....There are 500 cfm Holleys and 500 cfm Rochesters .....good luck swapping them without an adapter. ...See what I mean?