I have a 1985 IROC-Z that I'm putting a 383 stroker in. I'm converting the car to the 90-92 MAP setup (I have the new harness & ECM already) and running the Holley Stealth Ram Fuel Injection setup.

Aside from having to get a distributor with a small cap to fit, not sure what else I need. On Summit's website, they list the two distributors above. As far as I can tell, the only difference is one is cast aluminum and the other is billet. The billet one is about $115 more. Just trying to figure out if anyone knows of any other differences or any reason to pay the extra for the nicer distributor?

 

I'm not 100% sure, but the billet may be the pro series and will be stand alone with mechanical advance run through a box such as a 6AL. The previous one (I believe) is hei setup to run off computer timing control.