Ok i brought my gt40 heads to get re-done for my build...he called and said the exhuast valves need to be replaced...ok..a complete re-build is $350 then the guides needed to be replaced thats was another $100 and now valves no cost on that...so im sure i'll be into these heads for like $600 not including purchase price...Should i have him just rebuild them and ditch them and get a set of Trick flows or AFR's...any help would be great and where can i get these heads reasonable?......thanks