Check these ones out and give him a call. I just bought a set for a 360 I am building and a test fit showed them sliding right in but I have an LA block (old style). I used the comps on my last build and had to do LOTS of grinding.

http://www.mrlperformance.com/

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time