I'm in a similar situation building a AOD based stocker. It will run in IHRA pure stock without issues but NHRA indexes are pretty tough. I'm not saying it can't be done but you will need to work hard to match the et of a C4. I've also read 0.10 et loss for AOD vs. C4 but haven't personally seen it. Anyhow, if you haven't already you want to head over to
www.clickclickracing.com to get all your questions answered.
Good luck with your project.