AS in the title...I was going to use these heads on my 408 but have decided to sell instead. They are GTP stage 2+ heads that were put on the car last winter and made 463/402 on a mustang dyno using a TR T Rex cam. Heads are 317-320 CFM and were $2,800 new. I need to sell these ASAP so I will let them go for $1,000/buyer payes shipping or meets me to get them. No lower offers please.