gt40p heads off a 98 explorer.they are in great shape no cracks or rewelds etc.they have little port work done to them ,mostly gasket matching, stock valves and springs.they would be a huge improvment over stock heads and can handle a f cam and lower w/o the imediate need to change your valve springs. i had planed to use these on my 351 but found the header ports to be to large to seal at the head.feel free to ask any questions i have pics and can email them to you. if you would rather call my number is 301-672-2184 make sure you leave a message if i dont answer i will call you back
thanks dan