blown 440 Alky swap, how much will it cost?

I'm really thinking I would convert back to gas, I can't afford a new blower plus all the modifications I would need to make to handle that kind of power, I figure it would be more like 700hp with a 8 point cage capable of low 10's. will my 8 1/4 have to go? if so what are my best options? I have a full float Dana 60 4.1 but it still needs narrowing, axles, brakes so I wasn't inna hurry to get on that and it would probably be easier just to find a nicely built 8 3/4. I really don't want to scrap the 904, I put a lot of cash into it.

OK lets make it simple
1. 318 to 440 what do I need to change? TC,Transmission, mounts, rear end
2 .I can throw 3k at the 318 and be done with it at about 600hp or I can throw 3k at a can of worms and have up to 1500hp but how much more will it cost?