will 360 j heads fit on my 273

If you have not already bought the 360 heads DON'T. I have a 65 cuda that had a 273 with 360 j heads. No bottom end, even had them milled .080, still a dog. Removed the big .550 lift cam and replaced it with a stock 340 lift with 214 duration and still no power. Eventually replace motor with a crate spec 360. You would do better to rebuild the 273 heads and have them milled .020 to boost the compression. Good luck!