That would actually be the infamous L88 engine. The L82 was a 350 available from '73-'80.
The L88 was a barely streetable engine with very high compression, wild mechanical lifter cam, a big Holley, and aluminum heads. In race trim (headers, etc), it was rumored to put out close to 600 HP (Gross rating)...the 430 HP was a very under rated number.
L-88 streetable Well yes but don't expect to go for a midnight ride if you have any neighbors close by!! My L-88 wasn't quite that rare  one of 80 but I would guess that number of these motors that went across counter is 5-10 times that which is something that didn't happen with ZR-1