1) if you decide that you are definatly going to do the swap. I'd go to you local Toyota Dealer and order in a timing belt (whilst you are at it front and rear main seals and cam seals) that way by the time you have the wiring sorted the parts should be in. The 1G is on of those engines that being rare over there will not have a replacement part that you can get from the local spare parts dealer.
2) MA61 dash should work as long as it is compatable wiring wise. you may find that the tacho signal from the 1G might be weak and may need a booster.
3) those problems would be in the wiring I assume. I haven't heard of this one too much.
4) I can't help too much there, but if ytou search the net for either GA70 or GZ20 wiring diagrams they should help in you quest. also there is a pinout diagram of the ECU in the tech section of the old forums here.
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