Call George Keown (270)276-5216 or Carl Keown (270)276-5420. They've got a set of ported and flowed A-429 alum. heads and are upgrading to a set of TFS A-460 heads. I'm porting their A-460 heads right now and their FRPP A-429 heads have had the valve clipping issue (that 3000 sets of them had), fixed by me. They are good used heads. I don't know how much they want for them, so call them and ask please.