Actually engine mounts should be the identical clam shell style, just possibly may need to be relocated to a different ste of holes, which will already be drilled in the crossmember and frame rails.
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-'77 Electra 403/TH350
-'76 GMC C-1500 Sierra Classic 350 4-bolt/TH350, 3.40 ratio
-'68 C-10 chassis
-'72 K-5 chassis
http://communities.msn.com/RandyR72K5
Randy
Lincoln, IL
"life's gonna leave me in the dust, if I don't try and catch up to it soon"
r72k5@hotmail.com