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I have a stock 5.3/4l60e in my 68 firebird. It has lots of power and will fry the tires easily. I had it dyno tuned and it made 310hp at the rear wheels. it does have long tube headers. my car has 2.79 rear gears and 25.5" tall rear tires. That being said if I had it to do over again, I would have swapped in the ls6 cam and pushrods. it probably would have made close to 350 at the wheels If I had done that. the ls6 cam and pushrods can be has for under 400 bucks and works well with the stock converter.
 
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