All - very good answers .
pdpdub . . . . . that's very interesting = using your 2GC , 2bbl carb with your 250 L6 .
What I would like too ask - - - - "we need more info about this up - grade " !
I also know that SNS Member - taters ; was mounting a 2bbl carb onto the stock L6 (one barrel) GM intake.
I = myself have bought the OFFY 4bbl intake & Holley 390 CFM carb . . . . . . . . . . which has been the best up-grade , that I have done - on my stock 250 engine.
(plus = I had a very good 1bbl Mono-Jet carb, that ran 'great' for several year (I just wanted the 390 carb). With my old 1bbl carb , I was getting a constant 15 - 17 mpg .
My 390 Holley carb gets 21 - 22 mpg , and I do drive it kinda hard (more fun , having those back 2 barrels) .
Then , Here IS My Question , for you . . . . .
Can we see any pictures that you may have about "using your 2bbl carb" . . please.
Your Carb Throttle Linkage - and, how does that work ( ? ) . Any other info . . could help many SNS members , that are using those 'bum Rochester 1bbl carbs' .
I have listed those parts , about my 69 up-grades .................. and, I even "stretched-out those dollars" , for a couple of years , when making my changes ; plus, I was still working.
Maybe I just got really lucky with getting my Holley carb (I have had my carb off = once (too adjust my 'auto choke' . . . . installed right out-of-the-box ; installed back in 2017) .
AND, those 390 carbs are Going "Higher , as we speak'" .
Can I also ask = what current tranny are you using , with u'r L6 . . ?
By installing my 5speed , that was the SECOND Best up-grade , done too my Nova (3 pedals - for the 'fun factor' - vroom / vroom) .
Thank you , jim
part numbers ? . . Vendors / suppliers ?
which carb mounting system , did you use (one barrel adaptor, for the 2bbl carb) ? Summit list about 8 each, different one bbl - two bbl adaptors. (for the stock intake manifolds) .
home made throttle system = or store bought items ?
Pictures are " Golden " , for sure .
any other "secrets" . . ?