Even the AFR 165's would be superior in every aspect than a GT40, P or otherwise could ever produce.Stock valve size on the P’s are 1.85/1.46. I would say that by the time you buy valves, cut the pockets, have seats installed, and do a valve job you could sell them and pick up a set of AFR Renegades and have heads the GT40’s could never touch.

I know they used to be about the only thing you could get 'back in the day' and actually were good products, I've bashed their coils for years, oh well, time will tell how long they stay, they are red, I would prefer black, I will stick to 8mm wires although they are not needed cept for some extra heat protection.I have a Roadkill approved list I'll post with the pics that may or may not interest the two or three that may still be following.

I like those valve covers. want to do the same on my 84 gt350 project.It all depends on what your going to do and want out of your car..
I bought an Explorer ( mountaineer) engine for $400.. My main goal was a good running street engine and to relive my youth with a manual shifting car again..
I did not rebuild the original engine ( its a 1983 GLX vert) as I wanted a roller cam and a one piece main seal.....
The GT40P heads were on the engine, so I installed new beehive springs, vicron seals and had the machine shop do a simple valve job..
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You can have his, I know where he parks it and I'm friends with his dog, (that pooch ain't got a lick of sense)I like those valve covers. want to do the same on my 84 gt350 project.
looked for that bolt everywhere 'cept where it's hiding at, you'd think with the containers of mustang related 'stuff' I would have ONE! Nope! A couple were close but nope. Nothing local so I found some Ford Racing clutch bolts on Amazon, go figure, be here Sunday, 22 bucks, so I put everything away and ventured into the home office to load the pics into the big screen, a-n-d the computer and the fone no talkie to each other, plugged directly in....... charging ........... Tried different plug, nope
..... charging........ that's it.Factory valve covers from my 83 GLX..I like those valve covers. want to do the same on my 84 gt350 project.
Be careful, I abuse my dog and he is a really mean guard dog...You can have his, I know where he parks it and I'm friends with his dog, (that pooch ain't got a lick of sense)
found some Ford Racing bolts on Amazon (of all places) so this is where I wait, be here today (Sunday).
Forced induction=better gasketsLooks good. I've been planning motor build. Your comment on head gaskets got me searching, and I found some MLS gaskets with a compressed thickness of. 030". I think felpro comes out to .047". Anyone use these?
i know it should be resurfaced, never chattered with about 30-40k, I'm not hard on clutches.Is that flywheel good to go? Surface looks a little suspect but I’m that guy that will surface one just about every time.
Build is going good and if you are not misplacing or loosing bolts then you aren’t gonna have any fun.
have'n fun. That's what I tell people anyway.