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As far as 904's go if built right they can hold up extremely well to racing and strong street use If you use the proper stock internals and good clutches they will hold. 727's are great in heavy cars or trucks with big blocks but in a small car such as an A body or older B body with a small block the 904 is my choice.

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Adj the kickdown/solve the prob then you'll be in a neutral frame of mind to decide if you have enough power where a (727) upgrade is justified