Is it worth it?
 

Any opinions on having a 302 block machined for 1/2" studs? I was thinking of doing this while I was having my block assembled. Is it worth it or should I just run the spacer kit for my AFR heads?

That depends on how much power you plan on making. The rule of thumb I would go by is if you are thinking about O-ringing the heads then you will probably need 1/2" bolts. That's what many of the manufacturers go by as well.

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65 fastback
347 DFI injected, TFS heads, T5, 4.11 9", tc subframe conns, torq thrust D's
A little history lesson using today's tech.

I'm not planning on o-ringing the heads, but I would like to get about 450hp out of the motor NA. And if i'm feeling froggy I am toying with the idea of a 200 shot of nitrous.

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AFR 185's, TFS-R intake, HI-6 ignition w\PS-92 coil, C&L 76mm MA, 30lb injectors, MAC 70mm TB, MAC 1 5/8 long tubes, 2 1/2 Dr. Gas X-pipe, MAC 2 1/2 cat back, FPS 331 being built.