How do I increase the vcore to a 386/486 processor

Extra volts on a 486 or Pentium processor may help but not on a 386. It's a 5V processor and it won't respond to "voltage whipping" it'll just get hot and bothered. If the processor doesn't boot at 33MHz there may be other reasons caused by the mobo. You'll have to have a poke around with a scope.

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What makes your question lame is why would you want to speed up an old slow processor in the first place when you can buy newer faster processors very cheap?
Putting that aside, to do what you want, you have to have a schematic of the mother board you are using. The Vcore is probably provided by the power supply module. Maybe you can buy a power supply module that is designed to allow you to adjust the Vcore voltage. If not you may need the power supply module schematic too. You may be able to adjust the Vcore voltage once you fully understand how the power supply produces that voltage. Actually, there are forums out there where young geeks talk about raising Vcore and overclocking all the time. Look for one of those.

Well, at the risk of being another "slow",

First of all, you wouldn't want to increase the voltage if you want to run faster, you'd want to decrease it. Modern processors run their cores at 1.8v because the lower voltage causes much lower power dissipation and hence heat, which is one of the main problems of overclocking. (There's other reasons, too).

However, you can't drop the voltage much, if at all (look at the spec sheet for the chip to figure out the actual lower limit of the vcore supply). You might be able to make a small improvement by running the processor at the lowest possible vcore, but you also open yourself up to other problems due to different voltages on the mboard (for example, mixing 5V supplies with even 4.8V supplies can give rise to latchups and other nasty problems). So you'd want to drop the whole 5V supply, and then you need to make sure that every chip on the board can handle the lower voltage.

In the long run, it's just a lot of hassle that isn't likely to provide any benefit and IS likely to cause problems.