should i swap engines too an atlantic series!
 

to an atlantic formula from stock my car is a ae86. and how much would it cost.

Well since every Toyota enthusiast who can fit one is willing to sell their kidney for one. I think it would cost a fair amount, probably worth more than the car itself and for more money than it would cost to build a comparable high-output 4A-GE Silver-top or Red-top racing engine.

My estimate is about 6,000 - 10,000

However if you DO find something, I am willing to buy your old 4A-GE from you. :)