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From the 4 inch throw small block posts on here over the years It seems that the smaller cid 408 to 416 with good heads 300cfm to 330cfm make peek power around 6500 to 6800 with cams in the 260 to 270 @.050 range.... There really are too many variables for a rule approach 
Well my cam is 276 @ .050 and I need it to turn 7000-7200. I don't think that will be a problem.
I would think with 276 on the intake low 7s would be easy, Are you gona advance it 4*
Actually it should have been in at 108 but I had to move it to 104 to get valve to piston clearance.
.... you run that much exhaust duration & lift...  Must be a nitrous engine 
The exh is 284 @ .050 with .714 net lift. Not a nitrous engine, but it does have a TR and 2 750 Demons. It's a SS grind I got from a SS racer friend that only had about 20 dyno pulls on it. He said they made 650HP with it but they were still looking for another 30 HP. I don't know what they were twisting it to but I'm sure it was over 8000.
How did the new engine work out? Did it pull as you expected?
Yes it pulls fine to 7200, I just can't give any definitive numbers on it as the torque converter hub broke on the burnout and it was peeing fluid out the whole pass but what it ran is in my sig. I just finished putting my repaired, improved and stall adjusted converter back in the car yeaterday. I also took the 2.76 1st gear out. Hopefully I'll get to make a few passes this Sunday with it.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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