For rough guesstimating you can check the gallery for AD trucks of any size (1/2 ton up to about 3 ton) with a transplanted 454. If someone got it to fit in a small truck you can probably do it too. The space between the frame and under the hood is essentially the same for these trucks big or small.

The best way to find you answer is probably just start trying to stuff the engine in there. I was in much the same situation as you are when I started my engine swap, I searched for advice and someone else who had done it. Lots of trial and error and try again and finally it fits.

Grigg


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-