[blykins]

I know you were just quoting another website Dan....

However, his block is an aftermarket block. I've never had any issues with running the 4.100-4.170" stroke crankshafts in a production block and there certainly wouldn't be any in an aftermarket block. The 4" crankshaft that you use in a Dart/World/Ford Racing block has the same stroke as a crank that's used in a 408.

As far as the 289/302 engines, 500hp is very possible with pump gas and nothing more than a stroker kit and a really nice set of heads. My 347's make over 500hp, peak at 6500 and run on 93 octane.

My advice for the OP would be to get the engine in the car, then see what *he* is able to handle. 550-600 hp in a Cobra is a hand full.