YD block is a 400 from a 1970 Pontiac. Originally equipped with a 2 bbl and #16 heads, but these #16 heads are small valve.

WV block is a 1969 350 HO manual trans, originally came with #48 heads.

Compression with the #48s is on the high edge for pump gas. The small valve #16 might be a better choice on the 350. It really depends on what you want to do; there are other cam manufacturers besides Crane. I have an Isky in my dad's car, and a Summit going into mine. Cam selection will depend on the rest of your build.

1969 #46 heads are pretty much the same as the '70 #16s. Small valve heads.