QuickFuel got started by ex-Holley engineers / management that wanted to improve on certain Holley designed carbs...so they left Holley and started QF.  Eventually, Holley realized that they were losing market-share and purchased QF.  So now, QF and Holley are one big happy family...again.

The QF marine carbs that would likely be applicable to CCF applications are the M-600, M-650 and M-750.  The M-600 is based on the Holley 4160 and the M-650/750 are based on the Holley 4150.  The SBF 351W carbureted marine engines most likely came with a Holley 600 CFM 4160 carb as OEM from the factory.  These carbs have been considered by many to be the "industry standard" for many years.  However, there are some quirks and idiosyncrasies with the 4160 that get "upgraded" with the QF version M-600.

Upgrades on the QF M-600 that are NOT on the Holley 4160:

- External float adjustment hardware on primary and secondary fuel bowls (float adjustment in Holley 4160 is to bend the float hardware)

- Sight windows in primary and secondary fuel bowls for fuel level visual verification (no sight window in Holley 4160 -- fuel level is only estimated based on engine performance)

- Changeable air bleeds (fixed air bleeds in Holley 4160)

- Changeable jets in the secondary metering block (fixed jets in Holley 4160)

For somebody that likes to tinker and tweak the carb and fuel settings, the QF M-600 is an outstanding carb.  If you live at altitude and need to re-jet, the QF has changeable jets in both the primary AND secondary metering blocks for dialing in the carb.

Many of the Holley parts and QF parts appear to be interchangeable.  I had Holley gaskets and jets in my QF M-600 and M-650 carbs.

Another question to ask yourself is whether you want a 4160 or 4150 carb design.  I originally installed a QF M-600 (4160 design) but eventually replaced it  with the M-650 (4150 design).  I like the "double pumper" design and the mechanical secondaries of the M-650. The M-600 (4160) is a bit easier to install and set up, which may be a key reason as to why the 4160 was standard equipment on so many carb engines.

If you like to tinker and have a spare $700 lying around...by all means, get a QF carby.  If your 4160 Holley is working fine, you may want to run that tried-and-true Holley for a few more hours.

JQ

If one is not careful, all that tinkering, with little experience, can lead to serious frustration.  Ask me how I know…

I have a carb reference chart that shows the OEM stock configuration and settings.  Look on the carb choke tower for the VIN.  Typically 4 to 6 digits.  Hand stamped.  Usually to the right of the vent tube.  Send me a PM with the carb number and I will look up the OEM settings.  You can open the primary fuel bowl and remove the main jets from the metering block.  The jets have a size number stamped on it.  May be tough to see but the jet size should be there.  That will tell you if the carb has been modified from stock.  Same goes for the PV.

And ..................he can get whatever other info he wants from the chart too.

For someone running a stock 351 with a 4160, I think the perfect replacement is a Holley 4160 from PCM.  They run good right out of the box and don't need adjusting.  We've bought about 6 Holley's and 6 Quick Fuels over the past few years and the Holleys have run flawlessly right of out of the box.  4/6 Quickfuels have run great.  2 have been a PIA, both 650s. 
 

JQ