ATF can provide a spike in compression if used in the right proportions when starting a motor that has sat or has new seals in it.
It helps to set the seals for a moment on inital turn key. It is not the best way to go about getting a rotary running, but i have used it MANY-O-TIMES to get one fired up after a fresh build.
Another trick would be to pump compressed air directly into the TB on start-up.
IMO i would figure out the issue with timing if that is what you think the issue is with the car. If thats all it is in the i would not even consider the piston monstrosity you are thinking of putting in there. And if you do put pistons, LS1 or better :P
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