Speaking of carb's I had a Quadrajet on a 400sbc in a GMC Jimmy and I had that thing nose up, nose down and at some pretty harry side angle's without a stumble...
Also drove with a carb from S.E. WI all the way out to Cali in back through the mountains both ways in a Buick wagon with a 400 and had no issue's. A lot of the issue's people have with Carb's is there shit when they get them.
What I mean is.... there used up or wore out when you try and use them.
Example..
I had a 72 Duster that I built a 440 for .030 over 10.5-1 .590 hydraulic cam ..blah blah blah.. Brand new motor and trans etc. So I bolted on a rebuilt 750 double pumper carb that was done by the Carb shop "back in the day" and it started great ran good until warm. Then it would go dead lean, popping and banging etc. Shut it off and walked away, come back a couple hours later and it'd start right up and idle great. But after it got warm same issue, I messed around with that thing for a weeks on and off. I finally saved up enough money and bought a Barry Grant 850 bolted it on and it was night and day difference. The car started and ran awesome took it to the track multiple time and it would go faster each time.
Upon further inspection to the original 750 the throttle shafts bushings were wore out and when the carb got warm it would suck air past the bushings and throw the tune off. A lot of time heavy throttle return springs put undue strain on the shafts and bushings.I tore that carb down and replaced the bushing and rebuilt it again myself and it worked great. I o ringed the throttle shafts to use it on a blow through SBC but sold the whole works to someone who was still using it.
If you ever buy a used carb just be prepared for a bit o tuning and possibly a full tear down.
That's why I went with a new 750 truck avenger on the Jeep.
Also drove with a carb from S.E. WI all the way out to Cali in back through the mountains both ways in a Buick wagon with a 400 and had no issue's. A lot of the issue's people have with Carb's is there shit when they get them.
What I mean is.... there used up or wore out when you try and use them.
Example..
I had a 72 Duster that I built a 440 for .030 over 10.5-1 .590 hydraulic cam ..blah blah blah.. Brand new motor and trans etc. So I bolted on a rebuilt 750 double pumper carb that was done by the Carb shop "back in the day" and it started great ran good until warm. Then it would go dead lean, popping and banging etc. Shut it off and walked away, come back a couple hours later and it'd start right up and idle great. But after it got warm same issue, I messed around with that thing for a weeks on and off. I finally saved up enough money and bought a Barry Grant 850 bolted it on and it was night and day difference. The car started and ran awesome took it to the track multiple time and it would go faster each time.
Upon further inspection to the original 750 the throttle shafts bushings were wore out and when the carb got warm it would suck air past the bushings and throw the tune off. A lot of time heavy throttle return springs put undue strain on the shafts and bushings.I tore that carb down and replaced the bushing and rebuilt it again myself and it worked great. I o ringed the throttle shafts to use it on a blow through SBC but sold the whole works to someone who was still using it.
If you ever buy a used carb just be prepared for a bit o tuning and possibly a full tear down.
That's why I went with a new 750 truck avenger on the Jeep.
. I'm about to tear my mom's Heep apart because it's knocking real slightly. 
