The main problems you will have are the clearance at the radiator as the GMC engine is longer.The front engine mount is located an inch+ further forward.
.You may solve the radiator clearance problem if you use the GMC radiator as it is mounted a little firther forward than the chevy.(side brackets are angled differently on the two trucks.


There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!