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Definitely need to measure the static compression ratio exactly for the cam grinder. Dynamic compression ratios will determine the fuel octane requirements.

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This is a KEY step in building a motor (in your case: 500 HP). Once figured out, the cam parameters will be set for the goal. As far as induction: an 800/850 on an SD, Eddy RPM or even a WELL-tuned Eddy 6-pack will get you there. The other important steps are, paying real close attention to detail and (K)eeping (I)t (S)traightforward and (S)imple the KISS Principle! Go with what's PROVEN and DON'T experiment! In your case though, I'd make darn sure about the chamber
cc size and pay attention to the clearances, especially the quench (10.3 to 1 you/previous owner, estimated) since those KB146's have a step pad to help out with quench. Stock heads (2.08/1.74) aren't bad, but with porting and polishing?..2.14's/1.81's would have been somewhat better, especially with a competition valve job. Other than heads and intake, increased oiling capacity, hotter/recurved ELECTRONIC ignition setup and a free-flowing exhaust will do wonders. He should have already setup the chassis to handle this newfound power. Just as a note, 4-speeds aren't nearly as forgiving as
automatics. Food for thought!!

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500 hp and street manners. How serious is he about these two criteria? How would he know if it has 500 hp? To him, is "it should make 500 hp and it feels strong" good enough, or will he disappointed if it does not run 11.50s at 116 mph?

In the same regard, what is "manageable on the street" mean to him? This is such a personal thing.

The good news: his goal seems reasonable.

If he is serious about max power, there are a few key items before he gets to the carb and intake...cam, heads, and compression.

Need to know exactly what he has for compression ratio, 10.3 is a pretty good number. He might need to do some work on the combustion chambers to build quench with that piston, and GOOD head work. Add a nice mid-sized cam, like the MP .557 solid. Add SD and 850 dp....done. This would be Ron's (383man) engine, a proven combo. Nothing hard about this, but the details matter, and there is cost associated with those details.

If the 500 hp is not critically important, slap it together, add a 509 like hydraulic cam, SD and 850. Still a nice ride IMO.

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Thank you for the kind words. Yes my old 440 combo was a basic iron head streetable combo that probably made about 500 hp. It was a stock crank and rod 440 with .030 KB pistons. I used 906 heads I ported myself and the pistons had quench pads on them so I set it up for about .046 quench and it was 10.0 comp. I did use the MP .557 cam and the Holley Street Dominator intake with an 850 DP. It was in my 3700 lb 63 with 4.30 gears and 30" tall tires. It was an auto with a Dynamic 9.5 converter that flashed about 4200 but drives great on the street. The best it ran was 11.49 @ 116 on a good day. It usually ran from 11.50's to 11.80's depending on the weather.

I could also recomend a cam and then you might have 10 different cams to choose from. As many on here are pretty good at picking cams but the best you can do is call a cam company and let a pro go over your specs and set a cam up for you. I feel I know cams pretty good but I still had a pro who does this every day pick a cam for my eng in my car now. I had Dwayne Porter spec and grind a cam for my combo after he got all the specs on my eng and he is real good. Good luck what ever you decide but if you would want to call Dwayne I have his phone #. Ron