Very few were made with the true LT1. In 1979 it was 370 HP (highest of any GM small block at the time) with forged pistons and solid lifter camshaft, 4 bolt main, and the transitor (solid state) ignition 11.1:1 CR required high octane (I used to run av-gas when racing, or retarded the timing for premium of the time to avoid detonation).
The 1971 the CR was lowered to 9:1 and HP dropped to 330. 71 was the first year for hardened valve seats as well preparing for unleaded fuel (75 was mandated for all).
I don't have the exact production numbers, but less than 2,000 each were produced if I remember right.
I had the 1970 ( both the camaro and the corvette) but both are very rare.