67 Cougar 289 Intake and carb suggestions

Cougar Community
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I have a slightly built 289 in my 67 Cougar. Currently has an Edelbrock Performer and Holley 600 and runs well but the intake needs replaced. I have a new Edelbrock Performer RPM but not sure this is the combination I should use. I also have an original Autolite 4300 C7DF AL and the original cast 4 barrel manifold from a 289 K code 4 speed. Should I keep the original manifold and carb together or mix and match?
I’m open for any suggestion!
Thanks!

2

What look are you going for? Restored original or restomod? Kinda up to you. If it were me I’d be going for an original look.

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Looking at best performance but if there’s not much difference I would lean towards original even though it would add a few pounds?, for the original intake. Everything else on the car is pretty much stock.

4

I would use the Performer RPM with a Holley 600 carb. The old Autolites are notorious for leaking and they are only 470 CFM so not too good for performance either.

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5

Should I keep the old 1" spacer with the new RPM and Holley?

6

If it will fit under the hood yes but likely it won’t. A gasket with spacer built in that is around 1/8" thick is going to fit.

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7

Thanks for all the help Royce! Now just have to find that 1/8 spacer.

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I have a Performer RPM Air Gap with a 1" spacer on my 67. A phenolic is best in my opinion as it helps insulate the carb from heat. I am running a shorter (2") open element air filter to assist with hood clearance although I could run taller.

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Thanks! I think my Performer RPM is a lower profile than the Air Gap. So running a original stock 1" spacer with the low profile oval cougar air cleaner, I should have enough clearance.
Thanks for the input!

10

This is a difficult question to answer without knowing the cam profile and intended use. If a stock cam, I would stay away from the rpm intake. It is meant for a high revving engine that a stock cam can’t support. It is also designed to make horsepower at a higher rpm than the performer. If you want off the line torque, the performer is a great intake and much lighter than a stock unit. I wouldn’t go with the rpm unless you have the cam to match it.

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Its Melling torq cam Class 1 intended for street performance and fun!
Thanks for the input!