First off welcome to the board. The engine codes (typically in a 7G is 4g64), this info can be found on the sticker under your hood. It's right above the throttle body.
An engine swap is possible, but pricey and it is much more envolved than just bolting up a new 4g63T (the EVO engine) onto a stock 4 speed auto tranny. Search the boards and you are bound to find tons of great info.
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