Opinions on GMPP intake manifolds?

I am in the planning stage for a 454 buildup (not really buying parts yet - just learning). I have a chance to purchase a GM performance parts intake manifold (PN 12363407 - "Oval Port for Holley Carburetors "CNC"") for a fairly good price, but wanted to see anyone has experience with them before I commit.

This will be a fairly basic buildup for a full size Blazer (weekend driver/toy).

i think this intake is cut for the chevyzz 502 o port heads or the edelbrock block heads.it will not fit to good on the port match if used on older stock gm o ports heads:whacked: