302 Swirl port heads vs 340 X heads

To be completely honest I have absolutely no idea. It was in it when I got it, we inspected everything and it all looked good with very little wear and decided that it would be good to go to get her some seat time. She has never driven down the a race track yet so a 13 second car is a great place to learn. After a year of that and saving any money that we can we will build up from there.