I have started to drive my 86 305 TPI IROC. I am looking for a few mods a decent cat back. Right now I just have no muffler and a pair of Monza tips. I need a better cat back but which one I was looking at Magna flow. I would like to get a set of SLP runners as well as porting the plenum. The car needs headers but what kind are best? It has 3.42 gears and an automatic. I guess that means the peanut can with flat tappets. Which cam
Would work best? I have a set of 1.6 roller tip rockers ready to go on. I know I cannot use a newer one but would like something that at least comes with springs.

I think if I do the exhaust can some mild porting it might be a fun car. I have most mi or mods done as well as an MSD box and some nitrous.

Any other ideas I just really want decent cruiser.

Thanks