Re: 67-72 BigBlock 4x4s! Pos pics info here.
I went big block in my 68 GMC about 20 years ago.
Used a .060 454 4bolt block, steel crank, micro oval port heads hogged out to use 2.19in stainless valves, Performer cam and intake, HEI. Doug Thorley Tri-Y headers.
Did not have any clearance issues as I moved it all forward 2.5 inches, used all factory 72 Big block pulleys and brackets, stock V8 crossmember and a V8 2WD fan shroud,
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