Here you go. 455HP, a smooth idle, reasonable fuel mileage, and legal in California. Chevrolet performance E rod package. I know it breaks your $6,500 budget but you can thank the liberal tree hugger's and the people of your state that voted for for them. Turbo LS would be the most cost effective.
https://www.summitracing.com/parts/...MIpqOwoYDI3wIVEtbACh2tfgB1EAQYAiABEgKCqvD_BwE
Chevrolet LT1 6.2L E-Rod long block crate engine specs and features include:
* Cast aluminum with 6-bolt nodular iron main bearing caps
* Direct-injection, spark-ignition Gen-V small block V8
* Horsepower: 455 at 6,000 rpm
* Torque: 465 lbs.-ft. at 4,600 rpm
* Crankshaft: Forged steel
* Connecting rods: Forged powdered metal
* Pistons: Eutectic
* Camshaft type: Billet steel roller
* Valve lift (in.): .561 intake/.531 exhaust
* Camshaft duration (at 0.050 in.): 200 degrees intake/212 degrees exhaust
* Cylinder heads: Aluminum, rectangular port D/I
* Valve size (in.): 2.13 intake/1.59 exhaust
* Compression ratio: 11.5:1
* Rocker arms: Investment-cast, roller trunnion
* Rocker arm ratio: 1.81:1
* Recommended fuel: Premium pump
* Maximum recommended rpm: 6600
* Reluctor wheel: 58X
* Balanced: Internal
* Engine control module
* Exhaust manifolds
* Catalytic converters
* Mass airflow sensor and sensor boss
* Oxygen sensors and sensor bosses
* Air filter
* Accelerator pedal
* Evaporative emissions canister
* Instruction manual
https://www.summitracing.com/parts/...MIpqOwoYDI3wIVEtbACh2tfgB1EAQYAiABEgKCqvD_BwE
Chevrolet LT1 6.2L E-Rod long block crate engine specs and features include:
* Cast aluminum with 6-bolt nodular iron main bearing caps
* Direct-injection, spark-ignition Gen-V small block V8
* Horsepower: 455 at 6,000 rpm
* Torque: 465 lbs.-ft. at 4,600 rpm
* Crankshaft: Forged steel
* Connecting rods: Forged powdered metal
* Pistons: Eutectic
* Camshaft type: Billet steel roller
* Valve lift (in.): .561 intake/.531 exhaust
* Camshaft duration (at 0.050 in.): 200 degrees intake/212 degrees exhaust
* Cylinder heads: Aluminum, rectangular port D/I
* Valve size (in.): 2.13 intake/1.59 exhaust
* Compression ratio: 11.5:1
* Rocker arms: Investment-cast, roller trunnion
* Rocker arm ratio: 1.81:1
* Recommended fuel: Premium pump
* Maximum recommended rpm: 6600
* Reluctor wheel: 58X
* Balanced: Internal
* Engine control module
* Exhaust manifolds
* Catalytic converters
* Mass airflow sensor and sensor boss
* Oxygen sensors and sensor bosses
* Air filter
* Accelerator pedal
* Evaporative emissions canister
* Instruction manual