[RACER X #99]

427 Sharpe,
Your no replacement for displacement almost makes sense except for on thing. Big Block Fords FE or 460's are not known for good breathing cylinder heads. Even the best aftermarket BB heads do not flow as well as the best sb aftermarket heads.
For instance a sb 427 with Yates or Brodix heads will make much more power than a FE427 with anybodys cyl. heads. And if you really want a sb to out hp your BB then choose a sb Chevy which have heads that will outlow any sb Ford Head.
Just look at the cars running in the Pro and Big Cube classes in NHRA not many BB Fords. Or look at anybodys racing parts catalog. Lots of racing parts for big and small Chevy's but only a few for the Fords.
The Big cube argument may work for the Chevy crowd but when it comes to Fords it just ain't so.

Greg

So what is your best choice for a street only engine for your Cobra? How about a FI 302 out of a late model Mustang.