you will need a V8 tranny cross-member. possibly drive shaft depending on which you have in your car. and you will need a V8 input shaft on the 2.8 tranny If thats what you meant by using the world class in the car? i did the same conversion and it was Not cheap. used a 1983 firebird 2.8/200-4r car and went 355/th350. can be a fun build but A lot of things are different. wish you the best of luck!
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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