I purchased a set of heads and waited 4 months to get them. I would recommend buying them bare and do your own machining. The spring heights were out of spec and the seats were not sealing on the valves requiring a regrind of everything. Two of the Intakes were so tight they had to be driven out with a mallet to dis-assemble. I don't know if it was the distributor or AFD that caused all this greif but an E-mail to ADF did not get any action eccept
This has never happened before. My block is a 9.200" 351C but the manifold that came off my original 4V heads sat 9/16" high of the valley end seal surfaces. If don't have machining capability they aren't bolt on's. Check out my pic's of the custom valley plate required on my photobucket site.
Order from a distibutor and inspect before paying. I payed in advance, big mistake.
Kartjock
http://s378.photobucket.com/albums/oo228/kartjock/