Has anyone swapped a Holley in place of an Edelbrock on a 340?
The last holleys I messed with were 1850s, and I couldn't wait to see them go away. Under otherwise same conditions mileage went to about half of what it has been, couldn't do anything about it. One of those trucks (my brother's 79RC) I found a TQ for and much better. Ran better started easier and in that case ( where I live no worries but where he lives he has to pass smog or they won't let you renew your plates) it was a huge fail no matter what we did. We bolted the TQ on and solved that problem too. (here they don't care about being exactly numbers matching original carb as long as the numbers come in)
On my 79 D100 I actually bought a new 1850 and it didn't last. After fighting with my brothers truck to get it to pass and despite running better than decent I couldn't pass a gas station. That one got an original (aftermarket) AFB put on it, from before Carter was bought out. Again it ran even better than it did with the Holley. So since those 2 I have stayed away from Holley carbs. I sold those 2 that I had.
Now fast forward to a few years ago my son was playing with a 440 in a c-wagon that didn't have a carb on it when he got it. He put a then brand new current production Holley 650 on it and that one surprised me. It was actually pretty good in all the areas that I look at for a 3 season daily driver.
Now yeah I've had a few Edelbrock "AFB copies" that weren't as good as the rest I have had .. for one reason or another. Yeah I've had some percolation issues on hot engines even when they were otherwise great to me (not all of them I've used) but I think I have that one solved.