Although I cannot recommend doing this to an alternator, I can at least steer you in the right direction. The 3G's regulator is mounted to the back of the alternator. It is easily accessable and you can grind the regulator portion off its mounting plate. i.e. It can be easily modified to do what you want.
More importantly, when comparing the 3G to the Delco, a stock 3G will have regular diodes in it, a 130amp Delco will most likely have avalanche diodes. They I don't know that much about welders, I do know you cannot get more than 32volts out of an alternator with avalanche diodes. So me thinks the Delco most likely will not work.
If you do a thread search, there have been quite a few threads/posts on this subject. I think some even have links to step by step instructions.
