GT 40P heads/ what headers will work?

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I know a guy that used Hooker 6901s with them... However he says it's a pain in the buttocks.
He used a set of extra header flanges and gaskets stacked under the headers to space them away from the heads a little, then he used shorty spark plugs for a touch more clearance. For plug wires he used 90* plug ends and had to wrap them with insulation to protect them from the header tubes.
Normal heads have the plugs close to the tubes, but the P heads have the plugs right under the tubes where all the standard styles turn down. So there is a big interference between primary tubes and plugs.

351w (69-73) are better anyway once ported... I wouldn't bother with Ps.