Quote:

You don't have to put a ton of $$$ in those 915's to make them work. You will be MUCHO happier with them over the 452's in any type of HP project.

Maybe he got slapped for this post?
I'd like to see how much you'd have to put in to them. You've stated that performance is 2nd to drivability, so go with the heads in best condition. You can go 13s easy with those. 915s might pick you up a couple of tenths.