WELL THE GUY WELING UP MY EXHAUST SYSTEM JUST ZAPPED MY OE ALT WITH EXTERNAL REGULATOR(71 B/B)
THE CAR IS NOT ORIGINAL(ELEC. FAN, HEI,STEREO AMP
ETC. SHOULD I NOW UPGRADE TO A NEWER INTERNAL LARGER AMP ALT(IF SO WHAT DO I NEED TO DO WIRING WISE TO DO THE INSTALL)OR RETAIN THE EXT. REG. UNIT OR IS THERE A UPGRADE HERE, THANKS ROB
P/S I KNOW THIS QUESTION HAS BEEN ASKED MANY TIMES OVER, THANKS GUYS

Sounds like the guy doing the work owes you something. You can get a plug and play adapter kit from M & H. This will allow you to use an internally regulated alternator. Select your year and M & H shows the kits for the SI style alternator.
www.wiringharness.com (http://www.wiringharness.com)