Use a cam with a "tight" LSA with LOTS of overlap and low compression ratio. Best recipe I know of for a "rough" idle. Install a Comp 292H cam into a 400 engine about 7.7 to 1 compression ratio, it will give you the sound that you are looking for....but it woln't outrun a Dodge Neon with 2 plug wires pulled off!
Seriously, tight LSA grinds with big lobes make for a "choppy" idle. We like to put a lot of compression in those engines to keep power up at low speeds.
Low 10's on the motor requires a LOT of power. You'll need near 700hp at 3500lbs race weight. Mid to high 11's takes about 500-550hp, and is a lot more realistic for a pump gas street/strip type engine.....Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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