Hi guys what I have is the following
72 360 stock bottom end
J heads port matched 2.02 and decked .030
Doug 1 5/8 headers
Comp cam ex268h
Weiand Stealth I 8022
1/2 spacer
And 100 shot of nos at the track
What size jets do you recommend on my Holley 650 dp

Thanks guys Mopar or no car

Look up the List number on the choke horn and go to the Holley tech. site to get the stock jetting and start with the stock jetting and go from there

Here's a link. There's about seven variations of the basic carb, unless it's not a 4777.

http://documents.holley.com/techlibrary_carb_numerical_listing.pdf

R.

I appreciate all your input looking online I guess I need a vacuum gauge And some room to run the car

Without the power adder, jet for best mph at the track. Then see what adjustments should be made, if any, for the NOx.

I'm with Cab & Mattax. Start with stock jetting & adjust if necessary based on track data. The nitrous will be "naturally rich" by a little bit if you use the recommended set of "pills", so in most cases you don't need to increase jet size for the nitrous....maybe when you "fine tune" the car after dozens of track runs.

I suggest you never go over a 100-shot & are probably pushing the limits of cast pistons. If you have a way to adjust timing electronically, maybe pull out 2-degrees or so when the nitrous is on. A little retarded is safe & a little advanced or lean can blow a motor. Also, make SURE your fuel pump can supply the maximum fuel demands of BOTH the engine and the nitrous system (I melted a motor that way before). Lastly, run a little better gas than you need. If the car runs good on 89, put in 93 for the bottle. If it needs 93, then run 100-octane...just as a safety precaution. "Ping" on nitrous can break rings.

What do u think guys ??