Hooker to Magnum head problem! HELP PLEASE!

the bolt pattern should be the same.

another thing that i would watch out for is the header flange shape, it could potentially cut off some flow coming out of the head. when i was doing mock up with my R/T headed engine, i bought some cheap black jack headers and they were going to cut off flow because they were for LA heads with that dog-leg port. Magnum heads have eliminated that with basically rectangular ports.

hopefully this helps.