W2 headed 340...wiw?

I know it's hard to say for sure without seeing or hearing but I would like some input from folks that know more than me what a 340 that is now a 408 I think, W2 heads, 555 solid lift cam, all MSD ignition, 12:5 motor pretty fresh might be worth
Any input much appreciated

Not enough info. If it's a race-only piece, post a time slip along with what the car weighed at the time of the run, some info about the rest of the combo etc.

A 408 is usually 360-based, 340-based 4" strokers are usually in the 416-418 c.i. range depending on bore size.

W2s and strokers in general can take more cam if they're done right. Sounds like a mild combo but with 12.5 compression, something does not sound quite right with those specs. I'd verify everything. Maybe pull a head off and take a look.

W2 heads are old school iron. They work but things have advanced since they were introduced.

Is there an asking price? Does it run? What does it come with?