How street able are these 340 stroker motors?

DA4AD said

Wow wouldn't think it would be a 50 hp diff. I know the w2 heads are specific but I do have the x's I could use.
Looks like the six pac, x heads and stock exhaust manifolds will really choke up a stroker, on the other hand the extra cubic inches would help it out perform a stock 340!

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I run 11.79 at 117 though stock 68 340 exhaust manifolds at 410 CI. I know of a 444 that runs 11.5’s at 121? Mph with a 6 pack and the same exhaust manifolds. Do they hurt sure, at street car level........ahhh not to most peoples idea of street car. I know the 444 put out a very conservative 450 on the dyno.