You need an ability to tune your car if you tune the boost up. You can pop your engine if you tune the boost up and run too lean. A couple PSI isn't a bad thing. What is your complete mod list? You say you run a Walbro 255...with or without a fuel pressure regulator?
Even though this is a bench racing thread...you're going to lose. Miserably.
The 6.0 liter engine is worth 400 hp in the big 'ol goat. You don't have anything near that based off of your mods.
In other words, don't even race him. It's not worth it. Just read up more on how to maintain your car before you race him...or anyone else for that matter.
Well I got a big16g, walbro 255, fuel pressure regulator, bov, intake, boost controller, boost gaudge, and exaust. Thats it. And yea, I didn't really want to race him, I heard him go up my street the other day. Let me say damm, I could tell he was pushing some major power, in that beast.