Indy,
We recently dipped a 73 vette frame. I didn't like the surface condition on the exterior of the frame when we got it back - so we had it blasted too. All the crude and rust is gone from the inside - and the outside is spotless and perfect for paint. Depends on how you want it to turn out.
If you're only doing one, I would blast it.
I also blasted one myself with the syphon type unit (craftsman) and it worked fine - just make sure you have a compressor that can handle that cfm load - or it will take a long time. Degrease it and power wash it - then hit it with a wire brush to get the big junk off there - and blast it. I also used a face shield and a mask - it will pound your face and head pretty good.
Good luck !
Jim
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