1969 chevelle chambered exhaust

[rat tuned]

currently running dual 3" flowmaster 3 chamber muffs with dumps at rear axle. pretty darn loud but sounds mean. looking to make a few changes. engine is a 454 with ported oval port heads with big valves. changing from a cc 274h to an isky z55 solid camshaft. plan on 6500 rpm shifts. rear gears are 4.88s with a tight 10" 3200 stall converter. car is just driven around town and might do some of the 100' holeshot drag racing at local track. classic chambered has a true 3" diameter 31" long muffler. also want to run it out back with stock chevelle tips. i can't find anyone with a similar combo. also have 2 1/8" primary headers. do you guys think it will be obnoxiously loud? louder than what i got now? i love the chambered sound. thanx mike