I have a 230, and deliberately wanted to keep it as such, and see what it could do. Cam, zero deck, head work, lumps, compression bump, HEI.... so far I'm not impressed at all. The last things on the list are 2bbl and headers. If those don't really wake it up, then I'm calling it quits and licking my $3000 wounds, may sell the piece of sh*t. LOL.
Why a 2 barrel? lol And why are you expecting 500 hp out of 230 cubic inches? If anything stroke it to a 250 with a 250 crank and rods and you'll get over 300 hp. OR you could turbo it. But hell...If I had a little 230 in a 3500+ pound car I wouldn't be expecting a whole lot.
