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Quote from: shelbydoug on March 28, 2018, 06:39:27 AM
Not on a 67 or later manifold. That is for the large diameter thermostat.

oh - your right you need the smaller hole size.
Sorry.

Saw this on Ebay - Will this work?
It a C5 housing.

https://www.ebay.com/itm/1965-1966-Ford-Galaxie-Fairlane-Mercury-ORIG-FE-390-410-428-THERMOSTAT-HOUSING/162968617497?epid=6006353255&hash=item25f1afc219:g:ItkAAOSwk~NZ07sm&vxp=mtr

Here's two PI intakes showing the difference in the thermostat hole size.
On the left is a C6AE-H on the right C7AE-F

Marcus did an article on the 69-70 dash pads.

http://anghelrestorations.com/uploads/3/5/1/2/35122002/dash_pads_v1.0.pdf

There's been a discuss on the CJ forum on A intake recently

https://www.428cobrajet.org/forum/index.php?topic=24914.0

The 68 Mustang brochure on pg 12 shows a 8,000 tach and states available with any V8.

For 67 only the 289 Hi-Po got the 8,000 - the other V8' s got the 6,000.
All Shelby's were 8,000.

I had a 68 Mustang GT with a 390 4-speed had a 8,000 tach.

Don't know if this will help.