GT40P Upgrade questions

I had a blown head gasket on my 68 XR7 with 1988 302 and E7TE heads. Decided to upgrade to the GT40P head. Now realize that the plugs won’t fit with the headers I have. Has anyone done this and can you suggest a header that will fit? Power steering, no A/C and C4 auto. Thanks for any tips!

I ran manifold with mine and found that the K code HIPO manifolds worked. Reproduction versions are available.