[blue00gt]

I put the Edelbrock Performer intake, cam, and 600cfm 4-barrel package on my 79 pace car and it really woke it up, especially with dual exhaust. Those parts are all smog legal. If your cam is lumpier than stock but fairly mild, it should work well with the Performer intake. If you plan on changing your combo later, you may want to get a Holley instead of the Edelbrock as they seem to be a little easier to tune.
Definitely get some heads if you are serious about making power. There is no way you will make even close to 300hp with the stock heads that came on the 83 as they have pitifully small valves.