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Re: Whats the horsepower rating?
The 91 4.3 V6 VIN Z was rated at 160 HP / 230 TQ. I'm guessing the 305 in the caprice was the LO3. That was rated at 170hp. So for all that work involved in the swap you would only be getting 10 more hp and maybe 20 more ft lbs of torque. If you are going to swap in a V8, definately go with at least a 350.
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2000 Chevy Blazer ZR2
Performance Mods: Numerous
Suspension Mods: Some, but not enough
Exterior Mods: Just Right
1987 Buick Turbo T Dark Red
Low 11 sec sleeper 
.030 4.1 block, PT6262E, & other odds and ends....
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