All the other goodies such as roller tip rocker arms, new crankshaft, custom valve/head porting, Hipo distributor, and aftermarket ignition will certainly help to improve the performance but at a cost which returns smaller gains than the basic improvements previously noted. These adders will also go to increase those "Reckless Acceleration Demonstration" awards the local authorities like to bestow.
I have read where using cylinder heads from a 305 HO engine such as was in Monte Carlo SS motors will improve the breathing of your 283.
