Small block help

Me and my boy are restoring a 1971 Duster when I got the car the six-cylinder was taken out and 360 out of a magnum police package it is a heavy-duty motor just like the express. It's a 1979 motor. Stock is 195 hp and 280 torque. Iv put on long tube headers full boar single-chamber mufflers 2 1/2 true duel exhaust. It has a 600 Rochester carburetor on it for Barrel. My question is how will this perform in this car I have not been able to drive it cuz I'm in the middle of restoration. Will this car be sluggish or will it be fun to drive I'm not looking for a strip car just something might have a little fun if I want to. If this car is going to be sluggish what else can I do to it to give it a little more pep.
I'm not rich so I'm kind of looking for some easy tricks that me and my boys could do.