Disappointed with my engine

Retroboy said

I have a .040 over 360. Has **** J heads with 1.94 valves KB 190 pistons (small domes ). I have a Vertex mag, M1 intake and currently a 870 street advenger which is a vac secondary deal (carb needs further tuning). I have a Comp Cams Xe280r camshaft - I.570 242@ .050 and E .576 248 @ .050 installed straight up. Revs happily I've seen 7,000 on the tell tale. I have an 8" Turbo Action converter that flashes up toward 5000 and 4.33 gears. Car is very very light 1500lbs and it runs 6.3 on the 1/8 so that tells me it's only making 300 hp WTF ? I would think it should run well into.the 5's. What have I missed?

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I see you're in SA? people have gone pretty fast with stock heads so don't worry about that. I would look at the carb/ignition and tune before you even think about spending any money on new parts. Go find an old (yes old) 650 or 750 DP with stock jetting and start from there and make sure your leads are good and the advance curve is right. People expect to bolt parts together and then magically believe the engine will make a predetermined number, sometimes that happens and sometimes it doesn't. If you cant make 400 HP with a 360 with those parts something is wrong and its got nothing to do with the heads.

Good luck.