[dana]

Bluerooster,
The big block are not too expensive to beat on, unless you want to go 427so or vintage 428. The more modern 429/460/514 are way less expensive than the previous. Small block strokers cost more than standard big blocks.

There is a 2001 superformance for sale in connecticut. I think bob in ct is the guy. He has a 351 ( i think ) with all the standard spf goodies. He wants $46,000.

I would go to cruise nights and car show and see what you like. Try to bum rides in cobras. That's what i did. And ask a lot of questions. Cobras guys love to talk about their cars.
I went to ERA, FFR and SPF to look at their cars. I happened to be in all their areas for work so it was easy.
I would also go to the Carlisle shows to talk to the manufacturers there. Then you can compare them up close and personal.

I did what fordnut suggested. I put in a 392 with NOS just in case my large intestine ever got clogged up and I needed a cleanout.