I dont see how you could put an electric fan on the engine side and still keep the engine mounted fan. I've also heard that you dont want two fans, one inside and one outside, they suppossedly dont work well together. Keep the engine mounted and get a shroud, or lose it and put a good electric fan on. I think its better if they pull through the radiator like original, but I dont know from personal experience. I'm sure someone who has done this can give more insight. Good luck.
Jeff

"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."

1957 GMC 150