318 HP Estimate (Yes I know....)

Guys I know posts such as this are being brought out constantly but I have to ask. I have a co-worker(s) who are into street machines/muscle and constantly ask me how much HP I think my setup is getting. So to just give me some kind of estimate can anyone give me some thoughts. I just tell them 250HP but let's what you guys think.

318
Milled heads
Fresh Rebuild
Comp Cams 260H
Edelbrock 650 Carb
Edelbrock Performer Intake
Stock manifolds
Dual Dynomax Turbo Mufflers