Help with heads

Took a set of J heads to Nick at CompuFlow. He called and said they were both cracked by the spark plus holes. I have a set of 587 heads or a friend said he would get a set of Indy Arrow heads for 499.00. Has anyone ever used the Arrow heads? They look like a good deal to me. All done ready to bolt on. Thanks for your input.

Some have had problems with them.My son bought a set for his built 360 years ago.Had my machinist check them and they have been on since.No problems at all with his set.Rocky