I have a stock 454 with edelbrock intake, It had a holley 600cfm carb on it, I swapped it out with a brand new holley 750dp, when I had it at the river, it starts fine and runs good if you don't mash on it, the current jets are 72/80 with a 65 power valve, can someone help with the jetting size


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Squirter says 28 and the other I think says 31


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I have a stock 454 with edelbrock intake, It had a holley 600cfm carb on it, I swapped it out with a brand new holley 750dp, when I had it at the river, it starts fine and runs good if you don't mash on it, the current jets are 72/80 with a 65 power valve, can someone help with the jetting size


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What is it doing when you get in the throttle hard?

Holley used either 70 or 71 primary jets and 80's secondary.   The first thing I'd do is change the 6.5 power valve to a 3.5.  That'll slow down how quickly it starts dumping fuel through the power valve.

Inspect your plugs or install a fresh set then get a plug reading after a full throttle pass.  That'll help you determine if you need to adjust jetting or start looking for another issue.
 

Accelerator pump maybe....
Why not just square the carb up and plug the power valve?

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