Trust the ET formulas on the Internet?

[Gmanuel11]

I'm thinking of taking my 355 out to 383 (it'll probably need to be .040 over actually). The motor is currently making around 420 fwhp, so I was wondering what E.T. people think I can get with it, if the truck weighs 3900 with me in it (I'm a little guy) and has a th350 with 3.73 rearend.
Also, what does everyone think about 195 AFR heads, 9.5:1 compression, a Holley 750 carb, performer rpm manifold, forged internals, and the below cam for my 383 build? The stroker kit will be from eagle.

http://www.compcams.com/Company/CC/c...?csid=161&sb=2
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