internal voltage regulator alternator

[zicc1835]

can someone tell me a delco part # for a alternator im not running anything no air no big sound system im thinking 327 orig bracket on top universal for headers at bottom ive swaped a few alternators and voltage regulators i have had laying around and i cant get any more then 12 maybe reading want to see 13.4 at fast idle so im gonna make the swap to internal thanks in advance
jz