Head casting number further support the Alaskan_TA/ch1ll suggested W2 heads.
“W Head
The “W” series of small-block heads are high-performance heads. The W2 was introduced in the early 1970s. It was probably the best cast-iron small-block head for 40 years. The W2 has a casting number of 3870810, and the large, oval intake ports easily identify it. The W2 was offered as an economy version with cast pedestals; the race version had offset rocker shaft stands.”
How to Build Mopar Engines for Performance: Cylinder Heads - Mopar DiY
