Not a bad deal on it. They've gone up in price a LOT of the last few years. It seems about $25 - $50 every 6 months or so. I think the 300s are starting to get more and more common in the hot-rodding department and the intakes are being priced to match.
For what it's worth, the 240 and the 300 are identical
The only differences are in the size of the cylinder head chambers, and the length of the piston connecting rod. Otherwise, without looking up the part numbers, you can't visually tell one from the other. So, if it works on a 240, it'll work on a 300, and visa versa.
Lots will bolt a 240 head to a 300 for an easy 0.5 compression bump.
BB answered the 4 barrel question. I'll have to check out the gasket.
I bought one just like it a few weeks ago. I got the single plane b/c I was planning on running a 2150 on it, then found a deal on a QUICK FUEL SL-450. I hadn't seen anything about them being recommended for 500cfm and above, so do you know why this recommendation?
For the gasket, I'd go with the Remflex 3005. It's a fantastic gasket, and is great for non-stock mods like aftermarket intakes, headers, EFI exhaust manifolds, etc. It also doesn't need to be retorqued once installed. Just be sure to only buy it from SummitRacing, or Remflex themselves as they're the only authorized dealers, and the gasket gets damaged if it gets bent (which kept happening when I ordered it from Amazon).
It has to do with the volume of the plenum and runners. The big plenum slows down the intake charge, so the more air allowed in by the carb. The better. Personally, I run a Clifford open plenum, that's almost the same. I've run a 390 and a QFT 450 on it just fine.
Correct, it's the size of the plenum and runners. Granted, I ran a 390 cfm on an Offenhauser C and it worked just fine. But, to get the full benefit, you should go with a larger carb. The 300 has some BIG cylinders, and it is quite happy with 500 - 600cfm carbs.
The best gas mileage I ever got with my 300 was with a 600cfm Holley.
Btw, the QFT slayer 450 is a fantastic carb. Tons of adjustments compared to the old Holley 390 i had. It takes all standard Holley parts. The only 'advanced tuning' I did was shrink the power valve restrictors down a few thou. That and a slight upsize on the main jets were the only things I swapped.
I did remove the fuel bowl vent tubes and made an off-road style one like on the Holley truck avenger. I also added whistles to the fuel bowl vents, to help with off camber situations. However, they interfered with the floats, keeping them from fully closing the seats. So I trimmed the whistles to fit.
The QFT 450 is a really nice compromise of a "big" carb, and one small enough to give you that good, low end throttle snap. I really liked it. :) (I just like my Sniper more
I ran into the same thing with the vent whistles as they kept jamming the floats.
went further and added a secondary metering plate to his. But now he is running efi, and I have his collection of carb tuning parts.
Between him and the guys over at Fordsix I got it running great. Averaged 12mpg on the whole moab trip. I got 14 mpg on the way home, coming down from 11,000 ft to 900 ft. And that's at 3500rpm on the highway for 900 miles.
Sounds like some good mpg with the 37" tires! Gotta love that, especially at those RPMs. I'm curious how it'd do if you were able to get overdrive and bring those RPMs down below 3000.
Glad you have it running nicely..