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The 1250 carbs have a REALLY big throttle blade and tend to not work well on many motors. Just sharing my experience from what we have seem on other combos.
It is on my 505 C.I,.400 block bracket motor, 4.350 bore with 4.250 stroke, it has ran a best of 9.003 at 147.7 MPH in my 2780 lb 1970 Cuda bracket car 
Hopefully I can tune it to run 8.90 at or above 150 MPH this year, I raced it on the throttle stop most of last year due to not having NHRA Comp. racing drivers license and safety gear until mid August of last year
Quote:Not now, I bought the required gear and renew the old license
Well Cab if ya need a driver I know a guy
I'm debating on to try traing my middle grandson or not 
He's the only one of the three that is interested in any kind of car or motorcylce racing. Same way with my daughter and son, they never wanted to drive the drag cars, they both loved riding two, three and four wheelers in the desert though, especaiily Dumont dunes 
The wife would drive my old stocker at George Air Force base on thier old 1/8 mile track but not on any 1/4 mile tracks, she said the car was to fast in the 1/4 It would run 95 MPH in the 1/8 and 117 in the 1/4 mile Now if you know someone who can retrain a old guy like me so they can win more than one or two rounds at each race I'm in 
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Has anybody every converted a Holley 1250 Dominator gas carb over to E85? If so, what were your results and any pointer would help. Going on a 540cid (4.28" bore X 4.50"stroke) 12.3:1 comp with Indy -1 heads and about a .680 lift roller.
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That exactly why mark installed the smaller boosters to increase signal strength.also due the increased viscosity of e-85.the other fact as mentioned earlier was the transition slot. pat
Quote:Cab.....do you remember what jets were in there?
Try contacting AJ Casini on here for your conversion, I had him do a E 85 1150CFM HP Holley Dominator for me several years back, it works well
Quote:It came with 93 in the front with a power valve and 103 in the back.He did change the metering plates and put in a set of Dominator annular boosters with the flared skirts, probally doesn't flow 1150 anymoreQuote:Cab.....do you remember what jets were in there?
Try contacting AJ Casini on here for your conversion, I had him do a E 85 1150CFM HP Holley Dominator for me several years back, it works well
It does work very well, repeats like it is dead on
My carb is a good deal bigger CFM wise but with a more favorable blade booster sizing. Looking like my pair for the Predator will flow more cfm than 1250 as well.pat