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I'm using a Comp Cams Xtreme Energy flat tappet camshaft with their complete valvetrain and bigger valves, along with an Edelbrock carb and intake. With a good set of headers, I could probably get 320 hp at the flywheel
 

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You probably have an ~8:1 compression ratio By the way, I'm using forged flat-top pistons, which would be about a 10:1 comp.
 

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so are the comp cams extreme energy flat tappet camshaft really work for you then! how much did both of them cost u!
The full kit cost about $350, the intake and carb were about $400, and I think I have 2.12" intake and 1.54" exhaust valves. Whatever the biggest valves that can be fit in a 289 head are. The best I've ran is a 15.4 at 88 mph. However, I was ahead of an '01 Cobra for the first 300 ft. I don't think I have enough gears in my transmission, or enough rear gear.
 

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Yeah, those are the high-performance street cams. With a good 4v carb and intake, you could expect a gain of 60 hp. With your stock heads, power should be right off of idle, too. I've got a 750 cfm carb and ported heads so power comes in strongest after 3,000 rpm.
 
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